text: [6-12-03] All mail not bearing a simplified address under A020 must bear a delivery address that contains at least the following elements in this order from the top line:
  b. Private mailbox designator ("PMB" or optional "#") and number.
  d. City and state. (The city is any acceptable mailing name shown for the 5-digit ZIP Code listed in the USPS City State Product serving the intended recipient.)
  e. ZIP Code (5-digit or ZIP+4) where required. ZIP Codes may be omitted from pieces mailed by the general public at the single-piece rates for First-Class Mail and from pieces bearing a simplified address. ZIP Codes (5-digit or ZIP+4) are required on Presorted First-Class Mail, all mail claimed at automation rates, postcards mailed under specific First-Class standards, Periodicals, Standard Mail, Package Services, business reply mail, merchandise return service, mail sent to military addresses within the United States, and penalty mail. ZIP Codes are also required in the return address of mail on which postage is paid with precanceled stamps and company permit imprint and in the sender's return address on Periodicals when return service is requested.
  The ZIP (Zone Improvement Plan) Code system is a numbered coding system that facilitates efficient mail processing. The USPS assigns ZIP Codes. All post offices are assigned at least one unique 5-digit ZIP Code. Larger post offices may be assigned two or more 5-digit ZIP Codes (multi-5-digit ZIP Code offices). Separate 5-digit ZIP Codes are assigned to each delivery unit at these offices. Unique 3-