5-digit Postal Codes United States

Frequently Asked Questions

What is the US ZIP code system, and how is it used?

US ZIP code data depicts the boundaries of all United States districts. These districts are used by the US postal service to aid in efficient mail routing across the country.

Postal code tabulation areas (ZCTAs) are generalized aerial representations of United States Postal Service (USPS) postal code service areas. The USPS identifies post offices or delivery stations associated with individual mailing addresses, and its postal codes are a collection of mail delivery routes known as ZIP-codes.

Does the United States have ZIP Codes?

Yes. People also refer to postal codes as PIN codes. This is an short for Postal Index Number.

What is the length of postal codes in United States?

The length of a ZIP code in United States consists of 5 characters. These are 5 digits.

How are American ZIP codes structured?

American postal codes consist of five characters. These characters represent the following:

1xxxx : The first digit represents a broad area of the US. The number 1, for example, is used to identify Delaware (DE), New York (NY) and Pennsylvania (PA).
x15xx: The second and third digits represent the area's Sectional Center Facility (SCF)—in this case, these digits pertain to Western Nassau County.
xxx60: The fourth and fifth digits close in on a specific area, city or town.

How many postal codes are there in the United States?

Currently, the American 5-digit postal code database consists of over 41,000 areas.

What's the current postal code range in United States?

The current postal codes in the United States range from 00001 – 99950. The lowest and highest of these postal codes are both specific to areas in Alaska; The 00001 code is for the N Dillingham area, and the postal code 99950 is for Ketchikan, AK.

Explore ZIP Codes in the US for Free

Looking for an easy way to explore ZIP codes in the US? With our platform, you get access to a range of free tools to help you find, analyze, and understand ZIP/postal codes—no sign-up required.

ZIP Code Map Viewer – Easily visualize all US ZIP code areas on an interactive map.
ZIP Code Finder in the United States – Quickly search for any ZIP code or area in the country.
Random ZIP Code Generator – Get a random ZIP code in the US for testing or exploration.
City-to-ZIP Code Lookup – Discover which ZIP codes belong to which US cities. For example: New York ZIP code, Los Angeles ZIP code, Chicago ZIP code, Houston ZIP code, Phoenix ZIP code, Philadelphia ZIP code, San Diego ZIP code, Dallas ZIP code.
Street-to-ZIP Code Matching – Connect US street addresses directly to their corresponding ZIP code.

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