How to Find a Zip Code by Address

The United States Postal Service (USPS) recommends and prefers that all mail have a zip code included in the mailing address. A zip code is a five-digit code that the USPS has assigned to each geographic area in the country. The purpose of zip codes is to streamline and speed the mail delivery process. When you are unsure of a zip code, you can easily find it by using the rest of the mailing address and a few quick steps on the Internet.

Things You'll Need

  • Mailing address
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Instructions

    • 1

      Visit zip4.usps.com (see resources) to use the USPS zip code lookup tool.

    • 2

      Enter the street address into the first field. Enter the city and state in the other two required fields. Use the two-letter state abbreviation in the state field.

    • 3

      Click "Submit" and view the results in the next page. There may be more than one result if the address you entered has multiple apartment numbers, suites or floors.

    • 4

      Write down the correct zip code for the address you supplied.

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