Postal Explorer > Publication 28 - Postal Addressing Standards > 2 Postal Addressing Standards > 27 United States Postal Service Addresses

27 United States Postal Service Addresses

271 Format

Mail addressed to the United States Postal Service must contain a complete address.

Addresses may be located in the ZIP+4 file as street, firm, or Post Office Box records (record type S, F, or P, respectively). Most records carry the -9998 add-on code. However, many areas use different add-on codes.

272 ZIP Code or ZIP+4

The ZIP Code or ZIP+4 Code must be correctly applied for the United States Postal Service record as found in the ZIP+4 file.