The five-digit ZIP Codes begin with a digit from 0-9 that represents a region of the United States. ‘0’ represents the northeastern U.S. and ‘9’ is used for the western states (see list below). The next two digits identify a commonly linked transportation region and the last two digits pinpoint the correct processing center and post office.
United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.
What Does A Zip Code Look Like? United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area.The second and third digits represent a region in that group, such as a large city.
Do zip codes appear to be geographically grouped?
For instance, a single ZIP code is used for all US Navy mail. When ZIP codes appear to be geographically grouped, a clear shape cannot always be drawn around the ZIP code because ZIP codes are only assigned to a point of delivery and not the spaces between delivery points.
How do I find the ZIP code of a location?
You can also find the zipcode of any address or point clicked on the map. Searching for a city may not give you a result as there are many zip codes within a city. if this is the case click within the city limits to find the zip code of that spot.
What is the difference between ZIP codes and post codes?
The formats (where “X” means a letters sych as “A” “Z” and “9” means a We call then Post codes, not ZIP codes. Post codes are dicvided into two parts, the outgoing part and the incoming part. The outgoing part has between two and four characters and tells the post office system which post office is handling your mail.
What is an example of a ZIP code?
The standard zip code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US zip code is 90210.
What is a 5-digit ZIP code for the UK?
The current postal code (postal code) range of the United Kingdom (UK) is: AB10 1 – ZE3 9. The lowest 5-digit postal code (AB10 1) starts in Aberdeen, Scotland.
What are the last 4 digits of my ZIP code?
ZIP+4 Codes (ZIP Plus 4 Codes) are 4-digit codes added to 5-digit USPS ZIP Codes. The first five digits indicate the national area and destination post office / delivery area. The last 4 digits represent specific routes within delivery areas. 9-digit ZIP+4 Codes aid in routing and delivery efficiency.
How do I write a ZIP code?
‘Zip-code’ Is a Verb
Both, Dictionary.com and Merriam-Webster list “zip-code” as a verb, and they keep it all lowercase and use a hyphen. It means to mark something with a ZIP code, as in ‘Be sure to zip-code that letter.’
How do you write an address with a ZIP code?
If you want to improve the chances that the letter will make it to its destination quickly, you should use the five-digit ZIP code plus the four additional numbers that are specific to the area. To format, write the ZIP code with a hyphen afterward and then the four additional numbers will immediately follow that.
What is a zip code in Canada?
Like British, Irish and Dutch postcodes, Canada’s postal codes are alphanumeric. They are in the format A1A 1A1, where A is a letter and 1 is a digit, with a space separating the third and fourth characters.
What ZIP code means?
ZIP is an acronym for Zone Improvement Plan. However, the USPS intentionally chose the acronym to indicate that mail travels more quickly when senders mark the postal code on their packages and envelopes. It makes sense that the term ZIP code would be related to being zippy, which means “lively” or “peppy.”
Is ZIP code and postal code the same?
Zip Code refers to a postal code, used in a few countries with a postal address to specify the location at which mail is sent. On the other hand, postal code indicates the code used in the postal address, which assists in the sorting the mails for the purpose of delivering them at their exact destination.
How do I find my ZIP code UK?
There are several ways to find out the zip or postal code of any location in the UK, they are:
- Go to UK PostCode Website.
- On the search form that is in the top right hand of the page, enter in the address, city or county that you want to find its zip.
What is ZIP code UK?
( UK postcode) COMMUNICATIONS. a short series of numbers that is part of an address, and shows where a place is: legislation targets the neediest areas by zip codes.
What is my ZIP code UK?
Or Find the place
What are the zip codes in Texas?
Zip Codes in Texas 2022
|79912||El Paso||El Paso County|
What is the ZIP Code of Nairobi?
The Nairobi ZIP code is quite easy to remember – 00100.
What are the numbers after the ZIP Code?
Also called “plus-four codes”, “add-on codes”, or “add-ons”, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.
How do you enter a ZIP code?
You need to enter the format code in the Type box and click OK. Here is a cheat sheet for custom formatting codes: 0 represents digits can be filled by a leading zero if there isn’t a number. For example, if you want to a 3-digit number which should have leading zeros, you should use 000. If you enter 1, you will see 001. 12 will be 012. 123 will be 123.
How do you check your zip code?
– 000-044: Oct. 6 through Oct. 27 – 045-220: Oct. 18 through Nov. 5 – 221-375: Nov. 1 through Nov. 19 – 376-584: Nov. 15 through Dec. 3 – 585-719: Nov. 29 through Dec. 17 – 720-927: Dec. 13 through Dec. 31 – 928-999: Dec. 27 through Jan. 11, 2022
How many number are in a ZIP code?
ZIP Code™ is a registered trademark of the United States Postal Service. In its most basic form, a ZIP Code has 5 digits which identify either an individual post office’s delivery area, or a delivery area of within a larger city. A ZIP + 4 code consists of the 5-digit ZIP Code to which 4 additional digits are added.
What state has the most ZIP codes?
Zip Code City County Population ; 77449: Katy: Harris County: 128,294: 77494: Katy: Fort Bend County: 118,291: 11368: Corona: Queens County: 112,088: 79936: El Paso: El Paso County: 111,620: 90011: Los Angeles: Los Angeles County: 111,165: 60629: Chicago: Cook County: 110,029: 75034: Frisco: Collin County: 108,525: 11385: Ridgewood: Queens County: 107,796: 77084: Houston: Harris County: 107,673: 91331: Pacoima
What Is a ZIP Code?
When the United States Postal Service introduced ZIP Codes in 1963, it was to improve the efficiency of delivering the ever-increasing amount of mail in the country. ZIP Codes are five-digit numbers that designate local regions of the United States. It is abbreviated as ″ZIP,″ which stands for ″Zone Improvement Plan.″
The First Mail Coding System
- During World War II, the United States Postal Service (USPS) suffered from a scarcity of experienced employees due to the large number of people who left the nation to participate in the armed forces.
- In order to improve the efficiency of mail delivery, the United States Postal Service (USPS) developed a code system in 1943 that divided delivery districts within the 124 biggest cities in the country.
- The code would appear between the cities and the states of the United States (e.g., Seattle 6, Washington).
- By the 1960s, the amount of mail (as well as the population) had expanded considerably, since the great majority of the nation’s mail was no longer personal communication, but rather business mail such as bills, periodicals, and ads, which had replaced personal correspondence.
- The United States Postal Service required a more efficient way to manage the massive amounts of material that flowed through the mail each day.
Creating the ZIP Code System
- Several big postal processing sites were established on the outskirts of major urban areas in order to circumvent the transportation difficulties and delays associated with bringing mail straight to the heart of cities.
- As a result of the expansion of processing centers, the United States Postal Service established ZIP (Zone Improvement Program) Codes to identify specific areas.
- Robert Moon, a Philadelphia postal inspector, came up with the idea for the ZIP Code System in 1944, and it has been in use ever since.
- Moon believed that a new coding system was required, since he believed that the end of mail delivery by rail was imminent, and that planes will play a significant role in the future of mail delivery.
- It is noteworthy that it took nearly two decades to persuade the United States Postal Service that a new code was required and to put it into effect.
- ZIP Codes, which were first made public on July 1, 1963, were created to assist in the better distribution of the expanding volume of mail in the United States.
Every address in the United States has been assigned a unique ZIP Code for identification purposes.The use of ZIP Codes, on the other hand, was still optional at this time.The use of ZIP Codes was made mandatory for bulk mailers in 1967, and the general public swiftly adopted the practice.It was introduced in 1983 by the United States Postal Service (USPS) to further improve mail processing by breaking ZIP Codes into smaller geographic zones depending on delivery routes.
This code is known as the ZIP+4 and is found at the end of all ZIP Codes.
Decoding the Code
- Beginning with one of the numbers 0-9, the five-digit ZIP Codes identify an area of the United States and are followed by three more numbers.
- The northeastern United States is represented by the number ″0,″ whereas the western states are represented by the number ″9.″ (see list below).
- The following two digits designate a regularly linked transportation region, while the final two digits indicate the right processing center and post office in that region.
- ZIP Codes were developed to make mail processing more efficient, not to designate specific communities or geographic regions.
- Instead than being based on communities, watersheds, or community cohesiveness, their borders are dictated by the logistical and transportation requirements of the United States Postal Service.
- It is concerning that so much geographic data is based on and available exclusively based on ZIP Codes, as is the case now.
Because ZIP Code limits are prone to change at any moment and do not reflect genuine communities or neighborhoods, using geographic data based on ZIP Codes is not a good decision, especially in the context of climate change.Even though ZIP Code data is not ideal for many geographic applications, it has regrettably become the norm for separating cities, municipalities, and counties into separate neighborhoods.The use of ZIP Codes for generating geographic products would be preferable if data suppliers and mapmakers could avoid doing so.However, given the different geographies of the United States’ local political borders, there is frequently no alternative consistent means of establishing communities.
The Nine ZIP Code Regions of the United States
- There are a few exceptions to this rule, in which sections of a state are located in a different area, but for the most part, the states are located inside one of the nine ZIP Code regions listed below.
- Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Connecticut, and New Jersey all scored a 0 against the rest of the country.
- New York, Pennsylvania, and Delaware are the first three states.
- Virginia, West Virginia, Maryland, Washington, D.C., North Carolina, and South Carolina are the second-largest states.
- Tennessee, Mississippi, Alabama, Georgia, and Florida are the three states.
- Michigan, Indiana, Ohio, and Kentucky are the four states.
Montana, North Dakota, South Dakota, Minnesota, Iowa, and Wisconsin are the top five states.Illinois, Missouri, Nebraska, and Kansas are the six states.Texas, Arkansas, Oklahoma, and Louisiana are the top seven states.Idaho, Wyoming, Colorado, Arizona, Utah, New Mexico, and Nevada are the eight states.
California, Oregon, Washington, Alaska, and Hawaii are the nine states.
Fun ZIP Code Facts
- In Holtsville, New York, 00501 is the lowest-numbered ZIP Code, which is used by the Internal Revenue Service (IRS) to identify its location.
- The highest number is 99950, which corresponds to Ketchikan, Alaska.
- The lowest number is 12345, which relates to New York City.
- The ZIP Code that is the most convenient to use is for the General Electric headquarters in Schenectady, New York.
- As of June 2015, there are 41,733 ZIP Codes in the United States.
- Number of people living in each ZIP Code: Each ZIP Code has roughly 7,500 people living in it.
A cartoon character developed by Harold Wilcox of the Cunningham and Walsh advertising business, Mr.Zip was used by the United States Postal Service (USPS) in the 1960s and 1970s to encourage the use of ZIP Codes.Keeping it a secret: The President and the first family have their own, private ZIP Code that is not made public.
About US ZIP Codes
- US ZIP codes are a form of postal code that is used in the United States to aid in the efficient routing of mail by the United States Postal Service (USPS) and other organizations.
- On the map above, you can see ZIP codes that are close to me.
- ZIP codes are still referred to as ″US postal codes″ by certain people.
- ZIP is an acronym that stands for Zone Improvement Plan.
- A ZIP+4 code is formed by adding an additional four digits after a dash after the first five digits of the basic format, which was originally adopted in 1963.
- The additional four digits allow the United States Postal Service to more accurately categorize mail for delivery.
ZIP codes were initially designed for the United States Postal Service (USPS), but they are now used by many other shipping firms, including the United Parcel Service (UPS), Federal Express (FedEx), DHL, and others, for sorting parcels and estimating the time and cost of transporting a product (the shipping rate).
Types of Zip Codes
- A single high-volume address that is unique (for example, 20505 for the CIA in Washington, DC)
- Only a PO Box (for example, 22313 for the PO Boxes in Alexandria, Virginia)
- Armed forces
- standard (all of the other ZIP codes)
Assignment of ZIP codes and Mail Sorting
- The first number of a ZIP code in the United States often denotes a group of states in the United States.
- The map of the first digit of zip codes shown above illustrates that they are assigned in the sequence shown above, starting with the north east and working our way west.
- The first three digits of a ZIP code are used to establish the location of the central mail processing facility, also known as a sectional center facility or ″sec center,″ which is responsible for sorting and processing mail.
- All mail containing the same first three digits is sent to the same second center, where it is sorted according to the last two digits and dispersed to local post offices in the same order.
- The sec centers are not available to the general population and perform the majority of their sorting at night.
- As you can see from the map of the first three digits of zip codes, the digits following the first are also frequently allocated from east to west, as can be seen in the table of the first three digits of zip codes.
The number 0 is closer to white on the map, while the number 9 is considerably more vibrant.Despite the fact that there are a few outliers, it is simple to follow the gradient across each of the zones (such as the southwest tip of Georgia which uses 39XXX like central Mississippi).Although the ZIP+4 code is not essential, it does assist the post office in sorting mail in an extra manner.A ZIP+4 code may equate to a city block, a group of residences, or a single high-volume receiver, depending on the situation.
Every PO Box number corresponds to a distinct ZIP+4 code, which is another prevalent practice.Multiple PO Box numbers are often combined into the same ZIP+4 code by utilizing the last few digits of the PO Box number.This is known as grouping.However, because this procedure is not a general norm, the ZIP+4 code must still be sought up for each individual PO Box.
Places in the US so Remote, They Don’t Have a ZIP
- As you can see from the map, ZIP codes are not issued to every location in the United States.
- There are not enough deliverable addresses in remote and particularly rural sections of the nation to support the creation of a mail route.
- A ZIP code is not required if there is no postal delivery.
- In terms of getting away from civilization, these locations are some of the most isolated spots in the whole country if you choose to do so.
USA ZIP Code Boundaries
- Despite the fact that ZIP codes appear to be of a geographical character, this was not their original use.
- They are meant to consolidate mail in order to help the United States Postal Service to carry mail more effectively.
- It is common for ZIP codes to span numerous states in order to improve the efficiency of mail routing and delivery.
- In the majority of situations, addresses that are in close proximity to one another are put together in the same ZIP code, giving the impression that ZIP codes are defined by a distinct geographic border.
- Some ZIP codes, on the other hand, have nothing to do with geographical places.
- For example, the United States Navy uses a single ZIP code for all of its mail.
When ZIP codes appear to be spatially clustered, a distinct contour surrounding the ZIP code cannot always be drawn since ZIP codes are only given to a point of delivery and not the intervals between delivery locations.It is possible that ZIP codes may not be set or that their borders will be unclear in regions where there is no regular postal route or no mail service.
US ZIP Code Map
- According to the most recent USPS data, there is no official ZIP code map.
- The primary problem has already been discussed: there isn’t always a clearly defined geographic limit for a ZIP code.
- No official or completely accurate map of a ZIP code can be produced by the Census Bureau or other commercial services, but many of them will attempt to interpolate data to construct polygons (shapes formed by straight lines) to show the approximate region covered by a ZIP code.
- All ZIP code maps on this site are based on the ZIP Code Tabulation Areas (ZCTAs) defined by the United States Census Bureau in 2010 (or later) and explained in greater detail further down this page.
- They offer an extremely accurate representation of the geographic region covered by a ZIP code.
- When you look at our maps, you will quickly see that there are some border concerns.
When a ZIP code is not assigned to a location (as is the case in much of Nevada and Utah), it is because there are few, if any, addresses to which the mail may be delivered.It is important to note that if an address is located on the same street as a ZIP code border on a map, you should search for the entire street address to ascertain the ZIP code rather than depending on the map.
ZIP Code Tabulation Areas (ZCTAs)
- The United States Census Bureau created the tabulation regions for ZIP code numbers in the 1950s.
- Their objective is to provide statistical information on geographical areas that are recognizable to the majority of residents.
- ZCTAs, on the other hand, are not precisely the same as ZIP codes.
- Because of the difficulties in exactly defining the geographic region encompassed by a ZIP code, as previously stated.
- To account for some of the problems associated with assigning a geographic area to a ZIP code, ZCTAs were created in order to more accurately identify a geographical region.
- ZCTAs are also not updated on a regular basis like ZIP codes are.
In general, they are updated once every ten years in order to coincide with the United States Census.The Census allocates an area to a ZCTA based on the number of census blocks in the area (the smallest geographic unit used by the census).Consider the image on the right, which depicts a city block that corresponds to a normal census block.All four sides are bordered by sections of city streets, each with its own name and address, which surround the entire area.
The problem is that census blocks are usually often divided down the center of the street, which is problematic.ZIP codes seldom do this since it would necessitate two postal workers carrying mail to that street – one for each side of the street – which would be prohibitively expensive.A postal carrier may deliver to three sides of the block using one ZIP code in this example, while another mail carrier may deliver to the other street using a different ZIP code.As a result, because the census block is the area that has been exactly measured, the Census Bureau will allocate the whole block to a single ZCTA (in this example, 21044).
- It is nearly always necessary to split ZIP codes when getting extremely exact (typically a matter of meters, not miles).
- Census block borders towards the boundary of a ZIP code almost always result in this situation.
- It is possible to get insight into the demographics of a ZIP code by using the information published by the Census Bureau.
For example, have a look at our ZIP code rankings.
Matching ZIP Codes with States, Counties, and Cities
- Keep in mind that ZIP codes were created to make mail delivery more convenient.
- Their limits were not drawn in accordance with existing boundaries, such as those of cities, counties, or even states.
- Whenever it is more cost-effective for a mail carrier to drive over a state border to deliver mail, the ZIP code ″boundary″ will be extended across state boundaries.
- ZIP codes often do not cross state boundaries, although there are several that do (65733, 71749, and 73949 are good examples).
- Our comprehensive list of ZIP codes that cross state boundaries is accessible as part of our comprehensive list of ZIP codes in the United States.
- If you’re trying to assign a ZIP code to a certain county (up to 25 percent of ZIP codes cross county boundaries), congressional district, metro region (with time zone and area code), or other specific location, things get much more difficult.
The margins of the boundaries frequently overlap with one another.For the purposes of our free zip code database by county downloads, we will typically provide either the most frequent region for the ZIP code or numerous regions if more than one region exists in the ZIP code for the purposes of our free zip code database by county downloads.The assignment for cities is a little more difficult to figure out.The United States Postal Service (USPS) does not always utilize the city in which the ZIP code is situated.
The assignment of cities to ZIP codes is done on a more broad scale.The name of the city is typically the same as the name of the main post office.For example, practically all ZIP codes in St.Louis County, Missouri, are labeled as being in the city of Saint Louis, despite the fact that they are more appropriately defined as being in the name of a smaller city in which they are located.
- More information on matching ZIP codes to cities and counties may be found here.
Popular ZIP Searches
What is my Zip Code – Zip Code Finder
- We have determined the zip code in which you are most likely located based on your general location.
- Please share your location with us so that we may obtain your precise zipcode.
- You can also look up the zipcode of any location or point on the map that you click on.
- If you search for a city, you may not get any results because there are several zip codes inside a single city.
- The zip code for that location may be found by clicking within the city borders if this is the case.
- Depending on where you are located, you may receive the postal code of the nation in which you are located rather than the United States.
Based on your internet connection, we were able to determine your zip code or postal code.Please provide me with your precise zip or postal code so that I can locate you.You may share this map by clicking on the following link:
What is a zip code/postal code?
- To facilitate the sorting of mail in the United States of America, zipcodes are five or nine-digit digits that are appended to a postal address to aid in the sorting of mail.
- There are around 43,000 zipcodes in use today.
- This tool may also be used to locate the postal code of a variety of other nations.
- Postal codes differ from one nation to the next, but they are often a collection of numbers ranging from three to ten digits in length.
- In certain countries, such as the United Kingdom and Canada, postal codes are made up of a combination of numbers and letters, known as postal codes.
What else can you do with the zip code finder?
- Determine your ZIP code by answering the question ″What zip code am I in?″
- You may use this tool to get the zip or postal code of any address in the globe.
- Click on a point to locate the zip or postal code that is the most convenient for you
- In addition, the program will discover other bits of the address that you might utilize if necessary
ZIP Codes 101 – What Is a ZIP Code & How to Find It
- The ″ZIP″ in ZIP Code stands for ″Zone Improvement Plan,″ which is an acronym for ″Zone Improvement Plan.″ A ZIP Code identifies the post office or delivery region to which a letter will be delivered after it has been finalized and sorted for final delivery.
- ZIP Codes are used to define delivery routes used by mail carriers, as well as locations served by the United States Postal Service.
- To learn more about how they function and how to understand them, continue reading this article.
What Is My ZIP Code?
We make it simple to do a ZIP Code lookup for the United States Postal Service. Choose one of the options listed below.
|Enter an address to see the specific ZIP Code +4.||Enter a city and state to see the ZIP Codes for that city.||Enter a ZIP Code and see the city or cities it covers.|
|ZIP Code by Address||ZIP Code by City & State||Find Cities by ZIP Code|
- What is a ZIP Code and how do they function?
- What is the meaning of a ZIP Code and how do they work?
- Instructions on How to Read a ZIP Code
- ZIP Codes are lines, not shapes, as the name implies.
- ZIP+4 Codes are used in the United States.
What is a ZIP Code and how do they work?
- Postal ZIP Codes (ZIP Codes) are five-digit identifiers created by the United States Postal Service to identify particular post offices throughout the United States.
- A ZIP Code is just the abbreviation for the postal code system used in the United States of America.
- Most nations, including the United States, have their own names for their postal code systems.
- For example, the Indian government refers to its system as ″Postal Index Numbers.″ Postal Routing Numbers are what the Czech Republic refers to as their system.
- As a result, when you hear the term ″ZIP Code,″ think ″United States.″ The 5-digit ZIP Code is divided into three parts: the national area, the region or city, and the delivery area.
- The national area is the first component of the ZIP Code, followed by the region or city and the delivery area.
The United States Postal Service (USPS) has divided the country into ten ZIP Code zones, each with its own post office.They are numbered 0-9.They begin in the northeast and work their way west.The region covered by each ZIP Code is depicted on the map below: The following is how the first digit of the ZIP Code is assigned:
|ZIP Codes Beginning With||States|
|0||Connecticut, Massachusetts, Maine, New Hampshire, New Jersey, Puerto Rico, Rhode Island, Vermont, Virgin Islands, Army Post Office Europe, Fleet Post Office Europe|
|1||Delaware, New York, Pennsylvania|
|2||District of Columbia, Maryland, North Carolina, South Carolina, Virginia, West Virginia|
|3||Alabama, Florida, Georgia, Mississippi, Tennessee, Army Post Office Americas, Fleet Post Office Americas|
|4||Indiana, Kentucky, Michigan, Ohio|
|5||Iowa, Minnesota, Montana, North Dakota, South Dakota, Wisconsin|
|6||Illinois, Kansas, Missouri, Nebraska|
|7||Arkansas, Louisiana, Oklahoma, Texas|
|8||Arizona, Colorado, Idaho, New Mexico, Nevada, Utah, Wyoming|
|9||Alaska, American Samoa, California, Guam, Hawaii, Marshall Islands, Federated States of Micronesia, Northern Mariana Islands, Oregon, Palau, Washington, Army Post Office Pacific, Fleet Post Office Pacific|
How to Read a ZIP Code
- Following the assignment of the first number in a ZIP Code, the United States Postal Service (USPS) assigns the next two digits based on the location of the city.
- If an area has a major town or city, the United States Postal Service (USPS) would frequently award it the first ZIP Codes.
- Following that, the ZIP Codes will be shown in alphabetical order.
- The first three digits of a ZIP Code, when added together, often indicate the sectional center facility to which that ZIP Code belongs, according to most sources.
- This facility serves as the mail sorting and distribution hub for a certain zone or geographic area or region.
- Some divisional center facilities have numerous three-digit codes given to them, which makes it difficult to locate them.
For example, the Northern Virginia sectional center facility in Merrifield is issued ZIP Codes that begin with the numbers 220, 221, 222, and 223 to distinguish it from other similar facilities.The fourth and fifth digits of the ZIP Code show the geographical location of the city or municipality.For example, if a letter is received with a ZIP Code of 47722, the United States Postal Service (USPS) can determine that it is in Indiana (4), Vanderburgh county (77), and the region around the University of Evansville (22)
ZIP Codes are Lines, Not Shapes
- ZIP Codes are not assigned based on geographic boundaries such as state borders. In truth, because ZIP Codes are intended only for the purpose of increasing postal efficiency, they may and do transcend county and state lines. As an illustration: 42223 encompasses Christian County, Kentucky, and Montgomery County, Tennessee
- 97635 contains sections of Lake County, Oregon, and Modoc County, California
- 51023 and 51001 are located in both Iowa and Nebraska
- and 42223 spans Christian County, Kentucky, and Montgomery County, Tennessee.
- ZIP Codes do not represent physical areas; instead, they identify address groupings or delivery routes.
- Although most ZIP Codes may be loosely allocated to a geographic location, ZIP Codes do not represent geographic regions.
- As a result, ZIP Code ″areas″ might overlap with one another, be included within another ZIP Code, or have no geographical boundaries at all.
- For example, ZIP Codes that begin with 095 are issued to the Navy and do not correspond to a specific geographic place as a result.
- Similarly, ZIP Codes are not allocated to locations that do not have regular postal routes (rural route regions) or areas that do not get mail delivery (undeveloped areas).
- Because they are based on few delivery routes, the boundary between ZIP Code zones is indeterminate in certain places.
See our guidelines on how to locate a county by ZIP Code for further information.Whenever a ZIP Code crosses across a county boundary, Smarty (previously SmartyStreets) displays the default county in the line called ‘County Name’ and includes an additional line named ‘Alternate Counties’ in the table.
- The United States Postal Service (USPS) modified its ZIP Code system in 1983 to incorporate the new ZIP+4.
- A ZIP+4 Code is made up of the original five-digit code plus four more digits, resulting in a complete nine-digit postal code.
- With the whole ZIP Code, you may identify any tiny delivery segment, such as a street, a city block, a group of flats, or even a single address, which gets a large amount of mail.
- Using a ZIP+4 Code is not essential, as it is often computed automatically during the sorting and processing of the mail.
- ZIP+4 Codes are formatted as follows: As a general rule, each Post Office Box is assigned a unique ZIP+4 code.
- With a +4 on the ZIP Code, the last four digits of the box number are frequently used, as is zero plus the final three digits of the box number, or if the box number is less than four digit, zeros followed by the box number.
Because of this variation, the ZIP+4 Code for each Post Office Box must be searched up individually.Not all USPS deliverable addresses have a ZIP+4 code allocated to them, despite the fact that the majority of them do.For some addresses, geocoding lookups or address validation that need a ZIP+4 may not be successful, depending on the address type.While the United States Postal Service may not be able to offer correct geocodes for such addresses, Smarty can still provide roof-top level geocodes for the majority of addresses in the United States.
By experimenting with the Smarty US ZIP Code API or reading our ZIP Code API documentation, you can discover further possibilities.
3 Different Ways to Style ‘ZIP Code’ (or Is That ‘ZIP code’ or ‘zip code’?)
- The Quick and Dirty Guide to If you follow a specific style guide, double-check to see how it advises you write ″ZIP code,″ because each one appears to have a different guideline on how to write it.
- The following is advice from three main style guidelines.
- Today, we’ll start with the guidelines and conclude with a big dose of history since what I thought would be a simple query turned out to be a fascinating rabbit hole that led me to the point of interview.
- It all started with a voicemail message from a friend.
- ″Hello there, Grammar Girl.
- It so happens that I work for the Federal Government and have such a strong command of writing and grammar that I am affectionately known as the Grammar Guru.
While working on a report, something came up that needed to be addressed.It was suggested by some on the committee that the term ″ZIP Code″ should be capitalized…and my response is that this would be correct if you are referring to the particular item in question, such as a postal code or some other specific system, but if you are talking about the term ″zip code,″ it has become somewhat generic, similar to the term ″kleenex.″ If you chose to use this, I would appreciate it if you could answer it in your column, as I do not listen to your podcast.Thank you for your assistance, Grammar Girl.
I will continue to be a loyal reader.Once again, thank you.Good-bye, and thank you.″ Well, first and foremost, you should listen to the podcast, but the answer will also be available on the internet as a blog post.It is highly uncommon that the same piece of material does not appear on both sides.
- However, thank you for sending in your question as a voicemail, which I will be able to utilize in the podcast!
- For the same reason as before, I figured this would be a simple response: I’d check it up in a couple of style guides and wham, there’s the answer.
- However, it wasn’t as straightforward as that, and I soon discovered some fascinating nuggets.
What Are ZIP Codes?
- ZIP codes are a uniquely American phenomenon, as our overseas readers will attest.
- A postal address’s five-digit code may be found at the very end of the address’s body text (and if you want to be really detailed, you can add four more numbers to the end, and in my experience, doing that does help the post office deliver your mail a little faster).
- The address codes are sometimes referred to as ″postal codes″ in other nations, and some countries do not have them at all.
- The United States uses just numbers, although some other nations additionally use letters to denote time.
- Because our caller works for the United States government, and ZIP codes are something that the government does, I looked up the style guide for the United States Printing Office first.
- ″ZIP Code″ is the recommendation.
The Associated Press style is similar: ″ZIP code″—two words with the letters ″ZIP″ in all caps—but it uses a lowercase C, which shocked me because I expected it to use a capital C.I dug a little more and discovered this, which made me laugh: Someone inquired in the AP Stylebook’s Q&A section as to why the term ″code″ is lowercased yet the source, the United States Postal Service, capitalizes it, and the response from the AP editors was as follows: ″The United States Postal Service prefers capitalisation over lowercase letters.We each have our own own style.″ So there you have it!It’s simply that they like it in lowercase.
That is how styles function.
‘ZIP Code’ Was Trademarked
- I had no idea that ″ZIP″ stood for ″Zone Improvement Plan″ and that the United States Postal Service was the first to trademark the word ″ZIP Code.″ According to the information on the US Patent and Trademark Office website, the trademark was registered in 1997 and then lapsed in 1997.
- A ″TM″ is still there after ″ZIP Code″ on the United States Postal Service website, on the other hand.
- So it’s possible that I overlooked something, or that whomever is in charge of maintaining their website didn’t get the memo.
- Even while the Associated Press Stylebook does not include a trademark sign after ″ZIP code,″ it does not advocate that it be done for any trademark, therefore this does not provide any information about the trademark’s status.
- It was also revealed to me that the home furnishing firm Wayfair has a trademark for the use of the phrase ″zipcode″ (which is a single word) on things such as lamps, rugs and bedding, as well as on furniture.
- What a bizarre situation.
So I went to the website to see if they had any things that had the phrase ″zipcode″ on them, but they didn’t have anything like that.In its place, they have something that appears to be a house brand, dubbed Zipcode Design.As a result, it makes more sense.
Check 3 Style Guides and Find 3 Different Ways to Write ‘ZIP Code’
There are three alternative ways to write ″ZIP code″ according to the three style standards I researched. The ″ZIP Code″ is used by the United States Government Publishing Office. The Associated Press Stylebook employs the term ″ZIP code.″ The Chicago Manual of Style makes use of the term ″zip code.″
‘Zip-code’ Is a Verb
You might have thought we were done, but ″zip-code″ can also be used as a verb! In both Dictionary.com and Merriam-Webster, ″zip-code″ is listed as a verb, and both sites preserve the word in all lowercase and without the hyphen. When something is zip-coded, it indicates that it has been marked with a ZIP code, as in ″Be careful to zip-code that letter.″
The History of ZIP Codes
- ZIP codes are considerably more recent inventions than I had anticipated.
- The basic 5-digit codes that we use in the United States today were just adopted in 1963, and at the time, they were purely optional for consumers.
- There are probably still some individuals who do not have an address, and it was then that I realized I knew someone who was quite knowledgeable about the history of addresses and could tell me a lot of interesting facts about them.
- ″The Address Book: What Street Addresses Reveal about Identity, Race, Wealth, and Power,″ written by Deirdre Mask, is available for purchase on Amazon now.
- To listen to the interview with Deirdre Mask (which begins about the 7:15 mark), please use the player at the top of the page, or you can read the text of the interview below.
- The photo is courtesy of Shutterstock.
ZIP Code Overview
The Importance Of ZIP Codes
- A lot more recent than I had anticipated, ZIP codes are a relatively young invention.
- Although originally implemented in 1963, the basic 5-digit codes that we use today in the United States were were considered optional.
- There are probably still some individuals who do not have an address, and it was then that I realized I knew someone who was very knowledgeable about the history of addresses and could tell me a lot of interesting things about it.
- ″The Address Book: What Street Addresses Reveal about Identity, Race, Wealth, and Power,″ written by Deirdre Mask, is available for purchase online now.
- Listen to the interview with Deirdre Mask (which begins at the 7:15 mark) or read a transcript of the interview by clicking on the player at the top of the page.
- Shutterstock provided the image.
The American ZIP Code System (USPS)
- The ZIP code’s primary function is to expedite and streamline the processing of information.
- Processing delays may occur as a consequence of typographical errors in ZIP codes.
- The United States Postal Service is the ultimate source for gaining an in-depth grasp of the ZIP code encoding system.
- Hopefully, this extensive FAQ resource will be of use.
- What you’ll see is that every digit contained within a ZIP code has significance when considered as part of a systematic strategy.
ZIP & ZIP+4
ZIP codes in the United States are composed of five number digits.In addition to being known as ZIP+4 codes, they are sometimes referred to as add-on or plus-four codes since they feature four additional digits that define a geographic section inside a ZIP code delivery region.The first number of a ZIP code denotes a specific set of states in the United States.Each of the group’s second and third numbers represents a territory, such as a significant city, inside that group.
- It is just necessary to know the first five digits of the ZIP code in order to send mail.
- Including the complete ZIP+4 code, on the other hand, can shorten delivery times owing to the particular geographic information being conveyed.
- ZIP codes are converted into barcodes, which allow for the automatic sorting of mail, hence reducing the amount of human monitoring that is required in the process.
History Of The ZIP Code
The ZIP code system was established during a period of economic boom in the United States of America.Due to a quick increase in population as well as a burgeoning in commercial activity following the first and second World Wars, it developed out of necessity.During this time period, existing postal delivery methods began to fail as a result of the requirement for information to move across the whole United States continent more quickly than previously.A new system was developed in response to this, and it was officially deployed in 1963 following a 20-year development process by Robert Moon, who spent his entire career working for the United States Postal Service (USPS).
- A specified numerical system was used instead of a less organized recall of well-known cities, counties, and states in order to operate this system.
- This transition from a more informal and personal method of managing mail to one that was more defined and ordered sparked criticism and a 20-year battle.
- At the time of Moon’s death in 2001, he was credited with the development of the first three digits of the United States ZIP code.
- By 1967, ZIP codes were used to identify all mail delivered in the United States.
This period in history saw the United States Postal Service responsible for transporting 80 billion pieces of mail, an increase from the previous peak of 30 billion during World War II.Meanwhile, a new world of transportation was emerging, characterized by the use of trucks and airplanes, which were capable of transporting commodities more effectively than traditional train systems.As time went on, ZIP codes grew to serve a greater number of functions in American culture and society.When it comes to the United States Census, for example, ZIP codes are used to categorize demographic information, which includes but is not limited to educational attainment, family income, household size, and other population health indicators, among other things.
- ZIP codes are used by financial institutions such as banks, insurance providers, and credit card firms to determine interest rates.
- Zip codes are also employed in online purchasing applications, particularly in the areas of fraud detection and prevention, as previously mentioned.
- ZIP codes are essential for knowing the demographic features of the United States as well as conducting business inside the country.
ZIP Codes In Global Perspective
It is a member country of the Universal Postal Union that the United States belongs to (UPU). In order to promote the free interchange of worldwide mail, the United Nations Postal Union (UPU) relies on postal code standards created and maintained by the United States of America.
The United Nations Regulatory Body
The United Nations’ regulatory authority, the United Nations Population Fund (UPU), is reliant on member countries like the United States for funds, insights, and scientific leadership.Using Geographic Information Systems (GIS) technology from the United States, the Universal Postal Union has been able to construct new postal systems in developing countries from the ground up in recent years.A second function of the UPU is to act as a mediator in conflicts arising in a complicated global trade environment.The United States, with its ZIP code system and expertise, is one of the most generous donors to the United Nations Population Fund (UPU).
- Therefore, it is critical for technologists who deal with ZIP code data to realize that postal code systems have far-reaching geopolitical relevance as problem-solving tools, and that this understanding should be communicated to them.
Postal Codes In Canada (Canada Post)
There are two different systems of postal codes in use in Canada and the United States.For starters, ZIP codes are unique to the United States and are maintained by the United States Postal Service (USPS).When it comes to postal codes in Canada, they are administered by Canada Post, which is the country’s mail delivery agency.Canada, like the United States, has one of the most well-defined postal code systems in the world, which is similar to the United States.
- During the 1950s and 1960s, the country had a population boom, which coincided with the development of this system.
- This was the initial postal code, which was a three-digit system that was later expanded to a six-digit system starting in 1969.
- It is known as a forward sortation area (FSA) in the first three digits of the number, and it corresponds to a geographical location such as a province or territory.
- The second set of three digits relates to a local delivery unit (LDU), which is a collection of addresses that is described by the first set of three digits.
Postal sorting, automation, and the administration of demographic data have all been facilitated by the use of postcodes in Canada, which are analogous to ZIP codes in the United States for mail distribution.Because of the combination of our worldwide datasets and best-in-class technology, Loqate assists businesses all over the world in verifying client addresses.Using our simple to integrate API, our customers may validate customer data right at the moment of collection.Read on to learn more about how Loqate’s address verification solutions might benefit your organization.
More details about this data
About postal codes in the UK
The boundaries of all 5-digit postal code areas in the United Kingdom are depicted on this map of the United Kingdom’s postcode areas.This postal code system was developed by the Royal Mail, the national postal service of the United Kingdom, to divide the country into different geographical areas.Each region of the United Kingdom is assigned a unique code, which makes it simple to locate specific locations.Postal codes are also known as postcodes in the United Kingdom.
- The first postcode system in the United Kingdom divided London and other large cities in the country.
- A complete postcode designates a geographic area that contains a number of addresses or a single major delivery point.
Postal code structure of the United Kingdom
- The borders of the five-digit postal codes or districts in the United Kingdom are depicted on the map below. The following traits and attributes are contained within these 5-digit postal codes: The first and second numbers designate a specific local town or larger metropolitan area, such as London
- the second one or two digits designate a specific region and are separated by a space
- and the third one or two digits designate a specific country.
- Last, but not least, the final portion of the UK postal codes is made up of one number and two letters. An arbitrary code is what this is referred to as.
Current postal code range of the UK
Postal Codes in the United Kingdom (UK): The current postal code (postal code) range for the United Kingdom (UK) is: AB10 1 – ZE3 9. Aberdeen, Scotland is the location of the country’s lowest 5-digit postal code (AB10 1). Grutness, a tiny village on the Shetland Islands, is home to the world’s highest postal code (ZE3 9), which is located there.
ZIP+4™ Codes Lookup by Address
ZIP+4 Numbers (ZIP Plus 4 Codes) are four-digit codes that are appended to five-digit United States Postal Service ZIP Codes.The first five digits of the postal code identify the country and the post office / delivery region where the package is to be delivered.Individual routes within delivery zones are represented by the final four digits.The use of 9-digit ZIP+4 Codes improves the efficiency of routing and delivery.
9-digit Full ZIP Code Lookup by Address
We make it simple to complete a full ZIP+4 Code lookup by address using the United States Postal Service. To discover your ZIP+4 Code, select one of the options listed below.
|Enter an address to lookup the specific ZIP+4 Code.||Lookup several ZIP+4 Codes at once with the Bulk Tool.||Lookup ZIP+4 Codes programmatically using our APIs.|
|ZIP+4 Lookup||Bulk ZIP+4 Lookup||ZIP+4 API Lookup|
- The following topics will be covered in this article: How do I find my ZIP+4 code by address?
- How do I get my ZIP+4 code by phone number?
- How to Make Use of ZIP+4 Codes
- Is It Necessary to Have a Five-Digit ZIP Code?
- Meaning of ZIP Code plus four digits
- ZIP+4 Code Advantages in Detail
- ZIP+4 Code Database
- and Conclusion
How to Find My ZIP+4 Code by Address
If you watch this video, you will learn how to quickly and simply figure out your own ZIP+4 last four numbers. It will take you less than one minute.
How Full ZIP Codes Are Used
Knowing what the last four digits of a ZIP Code are all about necessitates a thorough understanding of what ZIP Codes are in general terms.The Zone Improvement Plan was developed by the United States Postal Service in order to make it simpler to send mail and parcels around the country.Due to the way mail was dispersed, it helped split the country into distinct ″zones,″ which aided in speeding up the sorting and delivery process.During the same time period that the Postal Service Department announced the Zone Improvement Plan on July 1, 1963, they also presented the world to Mr.
- ZIP ″Zippy,″ a fictional character created by the Postal Service.
- Zippy is the official ZIP Code mascot, and he can be found on our ZIP Codes 101 website as well.
- They also produced the ZIP Code jingle, which goes as follows: The audio element cannot be played because your browser does not support it.
- Since 1963, as the population of the United States has grown and dispersed, it has become necessary to extend the system in order to accommodate everyone and their canine companion.
That’s where the ″plus 4″ portion of the equation comes in.However, we’re getting ahead of ourselves, so let’s start with the fundamentals.
USPS Five-Digit ZIP Codes
These are the codes with which you are already familiar.They have the following appearance……and are most usually used to denote a destination post office.The reason behind this is as follows: If you’re shipping a letter from Boston to Seattle, the Massachusetts postal carrier isn’t really concerned with the street address of the recipient’s residence.What you may label ″beyond his jurisdiction″ is the situation.
- He only has to know which postal carrier to use in order for the other carrier to deliver the package to the correct address.
- On any given day, a postal worker can only cover a certain amount of ground.
- And because the United States Postal Service has a policy of delivering in all weather conditions, including rain, sleet, and snow, there is no way to provide the service of delivering in stages (some today, some tomorrow).
- In other words, each one post office can only service the area that it can reach in a single day.
That is reflected in the ZIP Codes.The majority of the time, a ZIP Code is associated with a post office; that is, every one of the latter has a corresponding one of the former.ZIP Codes may be thought of as a sort of postal address for a certain post office location.Some agents cover more than one ZIP code, but the majority of them operate on a one-on-one basis.
- Note that ZIP Codes are not ″boundaries,″ which is extremely essential to understand.
- They’re a collection of delivery routes that have been compiled.
- They do not adhere to physical or administrative boundaries, and they are capable of crossing city, county, and even state boundaries.
They travel in the same direction as the delivery vehicles.Some ZIP Codes are considered to be outliers.One type of ZIP Code is designated as ″military,″ and it includes anything from military sites (local and international) to battleships at sea.Then there are ZIP Codes that are ″unique.″ Because of the large volume of mail that businesses and organizations send and receive, they may be assigned their own ZIP Codes.These organizations regularly take advantage of bulk mailing reductions because they typically have a mail department that (1) presorts mail before delivering it to the USPS and (2) distributes mail internally so that the USPS is not required to do so.
″Military″ and ″unique″ ZIP Codes are similar to ordinary ZIP Codes in that they circumscribe their own delivery region.Visit our ZIP Codes page for a more in-depth look at the system.
ZIP Code + 4 Meaning
ZIP+4 Numbers are four-digit codes that are attached to the end of the original five-digit United States Postal Service ZIP Codes.When mailing with the United States Postal Service, using complete ZIP Codes ensures the fastest and most accurate delivery possible.Once an address has been authenticated and shown to be legitimate, they are only made available for that address to be used.Each of these numbers corresponds to a distinct delivery route, which refers to the actual path that a postal truck would take in completing a single drop-off.
- Typically, this consists of 10 to twenty different residences or sites.
- PO Boxes are also allocated ZIP+4 codes in addition to their regular ZIP codes.
- Typically, each PO Box is assigned a unique +4 Code, which is frequently the same as the box number.
- Because ZIP codes plus four additional digits are based on delivery routes rather than more permanent borders, the last four digits of a full ZIP Code can vary on a regular basis.
ZIP codes plus four additional digits are based on delivery routes rather than more permanent boundaries.It is also possible that five-digit ZIP Codes will change, but this will happen seldom; it is far less probable that you will be residing in a ZIP Code when it changes.This is not the case for the complete 9-digit ZIP Code.The +4 on a ZIP Code can be altered as frequently as once a month, depending on factors like as the number of postal employees on the job, who is assigned to which route, and other factors.
Benefits of Full ZIP+4 Codes
Numerous factors contribute to the good fortune associated with complete ZIP+4 Codes in terms of shipment.For starters, ZIP+4 Codes are subject to validation, which means that if an address has a ZIP+4 code connected to it, you can be certain that it is legitimate.Another advantage is that they may assist you in obtaining bulk mailing savings.Another significant advantage of using the final four digits of ZIP Codes is the speed with which packages are delivered.
- Complete ZIP+4 use on your mail can save processing and delivery times by as much as two days, depending on the volume of mail being sent.
- If you mark your items correctly, your mail will arrive more quickly, which is great news!
- I bet you’re scurrying around for those codes right now, don’t you?
- Get those additional four digits.
ZIP+4 Code Database
Using a CASS Certified USPS address validation vendor, such as Smarty, is often the most convenient approach for many users to gain access to the USPS ZIP+4 database.Because ZIP+4 codes are updated on a regular basis, data that is even a month old may be erroneous.Checking addresses against the database on a regular basis can help to guarantee that your data is as clean as it can be.It is also possible to gain access to the ZIP+4 Code database for free directly through the United States Postal Service’s website or through the USPS address validation API.
- If you elect to use the United States Postal Service’s database directly for obtaining ZIP+4 codes and validating addresses, proceed with caution.
- The United States Postal Service (USPS) has tight regulations for utilizing their address information, as well as performance constraints that might make your job more difficult.
- Prior to using their APIs, make sure you read the terms of service for the company.
- Our page on USPS APIs has a thorough list of restrictions and limitations.
Conclusion | What is My 9 Digit ZIP Code?
There will be three questions in the quiz:
- ZIP+4 codes are used to identify delivery routes.
- Using ZIP+4 Codes expedites and improves the accuracy of your mail delivery.