Zip Code Validator

Allows You to Validate Zip Codes

Enter a zip code that you wish to validate. Click the "GET VALIDATION" button to begin the validation. Upon successful completion of the validation, you will know if its valid or invalid.

Definition:

ZIP Code™ validation is the process of checking any postal address to ensure that the given ZIP Code™ meets all the below criteria:

  • Matches a valid ZIP Code™ in the USPS® postal data file
  • Refers accurately to the correct location
  • Is in the correct format and includes the ZIP + 4®

ZIP+4 Codes

In 1983, the USPS changed its ZIP Code system to include the new ZIP+4. A ZIP+4 Code uses the basic five-digit code plus four additional digits to identify a small delivery segment such as a street, a city block, a group of apartments, or even an individual address that receives a high volume of mail. The ZIP+4 Code is not required and is usually calculated automatically when the mail is sorted and processed.

As a rule, each Post Office Box has it's own ZIP+4 Code. The +4 on the ZIP Code is often the last four digits of the box number, zero plus the last three digits of the box number, or, if the box number is less than 4 digits, zeros followed by the box number. Since there is this variance, the ZIP+4 Code must be looked up individually for each Post Office Box.

Not all USPS deliverable addresses have a ZIP+4 Code assigned to them. For those addresses, geocoding lookups or address validation that require a ZIP+4 may not succeed.