United States ZIP Codes ▷ All USA Postal Code [Complete List]

USA Zip Codes

The concept of United States ZIP codes was first introduced and used by the Postal Service of the United States of America.

This system was formerly known as the United States Postal Service (USPS) 1963.

This was borne out of the need to enhance efficiency in the delivery system of mail services through easy collation.

Bringing about the need for the now commonly known ZIP Codes.

However, the acronym “Z-I-P” in the ZIP Codes stands for “Zone Improvement Plan”.

This ZIP code also consists of about five numerical digits, with an addition of four more digits in the year 1983, with the inclusion of a hyphen after the initial five digits.

The addition of the four digits in the ZIP Codes was designed to aid the precise identification of given locations within a specified ZIP Code.

This has since then been replicated globally.

If you have been curious about what ZIP codes mean and all questions surrounding them, we have the answers to your puzzles in this article.

Therefore, in this article, we will analyze all you need to understand about the United States ZIP codes and codes for states in the US.

What is the United States ZIP Codes?

The United States ZIP codes are a type of postal code specifically designed and used within the United States.

They are used to enhancing the mailing system of the United States Postal Service (USPS).

It is common to find people rage ZIP codes as the US postal codes.

Also, just as mentioned above, the acronym ZIP denotes Zone Improvement Plan.

Shipping firms like Federal Express (FedEx), United Parcel Service (UPS), DHL, and a host of others adopted the system of ZIP codes for collating and sorting packages.

This also extends to the calculation of proximity, time, and cost of shipping submitted packages (this is otherwise known as shipping rate/fee).

Criteria for United States ZIP Codes

It is important to know that for the United States ZIP Codes to be termed valid, the codes must:

  • Match the existing ZIP Code in the USPS postal data file.
  • Accurately show the precise town/city listed in the address.
  • Follow the correct format of the United States ZIP Code, which includes the ZIP + 4.

Types of United States ZIP Codes

The United States ZIP Codes can be grouped into four types, namely:

  • The Unique/Single High Volume Address Format (ex. 20500 for the American White House in Washington, DC).
  • The PO Box Only Style (ex. 98950 Main St, Vantage, WA).
  • The Military Format (ex APO AE 09001-5275).
  • The Standard Format (all other ZIP codes).

ZIP Codes Functions

ZIP Codes have become an important aspect of the mailing system globally.

Particularly in the US, ZIP Codes have significantly enhanced the system of mail management and distribution.

Here are 6 highlighted points analyzing the use and functions of ZIP codes:

1. Delivery Service Functions

Firms that are into collecting and delivery of parcels on behalf of their clients require ZIP codes for the delivery of packages.

This helps them in knowing the destination an item is headed for easily and grouping it approximately.

Moreover, at a glance of the ZIP code, necessary information can be easily known about the package, especially in terms of shipping rate and duration of delivery.

2. Statistics Functions

It is on record that as of October 2019, there are about 41,702 ZIP Codes in the United States.

The use of ZIP Codes in the United States is not limited to tracking mail.

However, it is effectively used in the gathering of geographical statistics in the United States.

The calculation of boundaries approximately by the U.S. Census Bureau is done using the ZIP Codes areas.

To this effect, statistical census data are subsequently given for these areas approximately.

Meanwhile, some of the geographic data given for these areas are the latitude and longitude of the center-point of the ZCTAs, which are about 32,000 ZCTAs.

The reason why there is no fixed ZCTA in each ZIP Code is because of the exclusion of PO Boxes

As such, it is only areas with high populations that are added to the Census data.

Additionally, the provision of many statistical data sets is provided by the Census Bureau for ZIP Codes.

However, this arrangement is not inclusive of updated datasets of every ZCTAs.

Furthermore, the complete datasets which provide an identical approximate geographic extent are available commercially.

This, by effect, makes ZIP Codes inherently confidential or point-based data.

This is also because they are allocated usually at the destination of delivery, and not due to the spaces in between the point of delivery.

The United States Census Bureau, therefore, interpolates these discrete data sets with the view to create arial features.

These features will represent the approximate level of the ZIP Code, used for data presentation and mapping.

It is important to note that ZCTAs should not be confused with ZIP Codes, especially since they are not updated with the latest.

3. Marketing Functions

The United States ZIP Codes are often used as a source of data, especially by organizations interested in strategizing effective marketing campaigns.

This is known as ZIP-code marketing.

Additionally, Point-Of-Sale cashiers can sometimes request consumers for their home ZIP Codes.

This data helps determine the purchasing pattern data of consumers, and the performance of businesses.

The interest of consumers and outreach of products/services are also determined this way.

Aside from the fact that ZIP Codes give a data report on the purchasing habit or pattern, they can be used to discover the location of new business establishments.

Directories can be used by retailers to assess ZIP Codes with the name on credit cards.

This is necessary to get information about target consumers, such as phone numbers and house addresses.

Also, ZIP-Coded data is used to assess geographic factors by companies in risk & insurance management.

As well as the banking industry, which is a practice referred to as redlining.

4. Legislative Districts Functions

In finding legislative districts in the United States, the United States ZIP Codes may be in common use.

Although the official website of the United States House of Representatives is known to have a “FindYour Representative” option.

This option searches for congressional districts using ZIP Codes alone.

However, it is known to redirect multiple districts related to one single ZIP Code.

This is because several parts of a United States ZIP Code can be located in different districts.

5. Internet Functions

In 1978, a proposal was made for a national system of community networks making use of United States ZIP Codes for routing.

The data obtained is an important part of the software on many websites called dealer/store locators, particularly brick-and-click websites.

This software is known to process a user-input ZIP Code that returns a list of business locations in a pattern of increasing proximity, from the center of the requested ZIP Code.

Meanwhile, customers located outside of the United States of America cannot be registered on U.S. websites.

This is because the United States ZIP Code system is restricted to the U.S. Postal network.

However, to circumvent this limitation, many websites do buy postal code data from other countries.

They alternatively make allowances in situations where the ZIP Code is not authenticated.

Furthermore, the ZIP Code is commonly used on the Internet to provide a location under circumstances where a precise address is not compulsory.

However, the user’s municipality is required.

A typical example is a local news, television listings, weather forecasts, online dating, etc.

6. Credit Card Security Usage

The authorization of credit cards is done using ZIP Codes, known as the Address Verification System (AVS).

This is because the ZIP Code is an important part of AVS, and the merchant is expected to collect the entire address.

However, there are some cases in which ZIP Codes are the only thing required for AVS.

Especially where the collection of signatures or other necessary information is not possible, like in vending machines.

United States ZIP Codes

State Capital ZIP Code
Alabama (AL) Montgomery 35004 to 36925
Alaska (AK ) Juneau 99501 to 99950
Arizona (AZ) Phoenix 85001 to 86556
Arkansas (AR) Little Rock 71601 to 72959
California (CA) Sacramento 90001 to 96162
Colorado (CO) Denver 80001 to 81658
Connecticut (CT) Hartford 06001 to 06928
Delaware (DE) Dover 19701 to 19980
Florida (FL) Tallahassee 32003 to 34997
Georgia (GA) Atlanta 30002 to 39901
Hawaii (HI) Honolulu 96701 to 96898
Idaho (ID) Boise 83201 to 83877
Illinois (IL) Springfield 60001 to 62999
Indiana (IN) Indianapolis 46001 to 47997
Iowa (IA) Des Moines 50001 to 52809
Kansas (KS) Topeka 66002 to 67954
Kentucky (KY) Frankfort 40003 to 42788
Louisiana (LA) Baton Rouge 70001 to 71497
Maine (ME) Augusta 03901 to 04992
Maryland (MD) Annapolis 20588 to 21930
Massachusetts (MA) Boston 01001 to 05544
Michigan (MI) Lansing 48001 to 49971
Minnesota (MN) Saint Paul 55001 to 56763
Mississippi (MS) Jackson 38601 to 39776
Missouri (MO) Jefferson City 63001 to 65899
Montana (MT) Helena 59001 to 59937
Nebraska (NE) Lincoln 68001 to 69367
Nevada (NV) Carson City 88901 to 89883
New Hampshire (NH) Concord 03031 to 03897
New Jersey (NJ) Trenton 07001 to 08989
New Mexico (NM) Santa Fe 87001 to 88439
New York (NY) Albany 00501 to 14925
North Carolina (NC) Raleigh 27006 to 28909
North Dakota (ND) Bismarck 58001 to 58856
Ohio (OH) Columbus 43001 to 45999
Oklahoma (OK) Oklahoma City 73001 to 74966
Oregon (OR) Salem 97001 to 97920
Pennsylvania (PA) Harrisburg 15001 to 19640
Rhode Island (RI) Providence 02801 to 02940
South Carolina (SC) Columbia 29001 to 29945
South Dakota (SD) Pierre 57001 to 57799
Tennessee (TN) Nashville 37010 to 38589
Texas (TX) Austin 73301 to 88595
Utah (UT) Salt Lake City 84001 to 84791
Vermont (VT) Montpelier 05001 to 05907
Virginia (VA) Richmond 20101 to 24658
Washington (WA) Olympia 98001 to 99403
West Virginia (WV) Charleston 24701 to 26886
Wisconsin (WI) Madison 53001 to 54990
Wyoming (WY) Cheyenne 82001 to 83414

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From the analyzed insights above, the United States ZIP Codes have developed on purpose from just a means of collating and distributing mail.

It has more sophisticated functions, like data collation for census demographics and data gathering for security needs (especially in preventing and controlling crime).

Also, they have enhanced certain aspects of Internet functionalities (especially as regards online shopping).

Moreover, the financial world uses obtained data from the United States ZIP Codes to calculate rates of services for their clients.

This shows significant importance in the relevance of the USA ZIP Codes in the development of human interaction, especially in the United States of America.

Thank you for reading.

We hope this article has answered all your queries.

Kindly share your thoughts with us in the comment section.

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