Secondary address unit designators, such as APARTMENT or SUITE, are required to be printed on the mailpiece for address locations containing secondary unit designators.

C1 Street Suffix Abbreviations | Postal Explorer

Guidelines for secondary unit designators in postal addresses, including abbreviations and formatting tips, to ensure accurate mail delivery.

352 Abbreviations Use the standard business and address word abbreviations for address data elements whenever necessary. These abbreviations can be found in Appendix G. It is recommended …

Postal Explorer Appendix G provides guidelines for postal addressing standards, ensuring accurate and efficient mail delivery.

The Postal Service defines a complete address as one that has all the address elements necessary to allow an exact match with the current Postal Service ZIP+4 and City State files to obtain the finest …

Street Address Use a Post Office box or street address, but not both. If the address also has a directional (for instance, NW for Northwest), be sure to use it. There may be more than one Main …

A2 Address Types A3 International Addresses Appendix B Appendix C C1 Street Suffix Abbreviations C2 Secondary Unit Designators Appendix D D1 Hyphenated Address Ranges D2 Grid Style …

If you can't fit the suite or apartment number on the same line as the delivery address, put it on the line ABOVE the delivery address, NOT on the line below. Words like "east" and "west" are called …

Mail with a dual address (both a street address and a Post Office box number) is delivered to the address immediately above the city and state (or to the Post Office box if both the street address and …