U.S. POSTAL CODE DIRECTORY

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How to Find a ZIP Code by Street Address

U.S. ZIP Codes Guide · Updated November 2026

The most reliable way to find a ZIP Code is to search using the complete street address, including the house or building number, street name, city, and state. Address details matter because nearby streets can fall into different delivery areas.

Check spelling, apartment or suite numbers, and directional prefixes such as North or Southeast. If a result looks unexpected, compare the city and state shown with the address you entered. For official mailing use, confirm the address through USPS address validation.

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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