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ZIP+4 Codes are 4-digit codes appended to the original 5-digit USPS ZIP Codes. Using the full ZIP Code with the extra 4 digits when mailing via the USPS ensures the fastest, most accurate mailing possible.

UnitedStatesZipCodes.org is the most comprehensive resource for United States zip code data.

UnitedStatesZipCodes.org is the most comprehensive resource for United States zip code data.

These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

USPS.com Who better to get a zip code from than the United States Postal Service? When you land on the site you can search for a zip code by street address or city and state. Remember, some larger towns can have more than one zip code.

The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

Find Zip Codes at USPS.com If you have an address or partial address, you can find the zip code through USPS Zip Code Lookup, a tool on the U.S. postal service's website. You can also search by city or state, or find all cities that are part of a particular zip code.

The Zip Code Database project exists to provide US Zip Codes in their entirety; latitude and longitude coordinates included! The downloads are in CSV and MySQL table dump formats. Have you found the Zip Code Database project useful? Please let us know!