SubscribeSecondary address unit designators, such as APARTMENT or SUITE, are preferred to be printed on the mailpiece for address locations containing secondary unit designators printed on the mailpiece for address locations containing secondary unit designators. The preferred location is at the end of the Delivery Address Line. The pound sign (#) should not be used as a secondary unit designator if the correct designation, such as APT or STE, is known or is shown in the ZIP+4 file.Appendix C2 of the document contains the complete list of approved designators and their approved abbreviations. The appendix also mentions that if you omit the designator, you are required to use a pound sign (#). Section 213.2 specifies that if the pound sign (#) is used, there must be a space between the pound sign and the secondary number.
334 MAIN ST SUITE 312 or 334 MAIN ST STE 312, otherwise use 334 MAIN ST # 312.You are not logged in, either login or create an account to post comments
USPS's page on proper address formatting shows the address with the "Ste" designation.
Here is another site about proper address formatting that includes "Ste."
posted by LobsterMitten at 12:10 AM on January 30