U.S. POSTAL CODE DIRECTORY

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Find ZIP Codes by city, state, county, or number. Explore location details with a clean, easy-to-use directory.

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How to Look Up ZIP Codes by City

U.S. ZIP Codes Guide · Updated November 2026

Searching by city is useful when you know the community but not the street address. Enter the city name and state abbreviation together to reduce confusion between places that share a name.

A city may have several ZIP Codes, and a ZIP Code may serve more than one nearby community. Treat city search results as a starting point. If you are mailing a package, confirm the exact street address because a city-level match alone may not identify the correct delivery code.

For address-specific mailing decisions, verify the complete delivery address with the United States Postal Service (USPS). This directory is provided as a general reference.

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ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the code in the postal address. The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the ZIP code, a hyphen, and four more digits that determine a more precise location than the ZIP code alone. The term ZIP code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service, but its registration has since expired.

ZIP codes designate only delivery points within the United States and its dependencies, as well as locations of its armed forces. There are no ZIP codes reserved for designating mail bound for foreign destinations (with the exception of U.S. military units stationed outside of the United States), and therefore, international outbound mail should not include a ZIP code in the delivery address. The last line of a foreign address must only show the name of the country of destination.

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