D.M.M. 602 1.3e(2)
1.3 Address Elements
All mail not bearing a simplified address must bear a delivery address that contains at least the following elements in this order from the top line:
a. Intended recipient’s name or other identification.
b. Private mailbox designator (“PMB” or alternative “#”) and number if the mailpiece is addressed to a commercial mail receiving agency (CMRA) address.
c. Street and number. (Include the apartment number, or use the Post Office box number, or
general delivery, or rural route or highway contract route designation and box number, as applicable.)
d. City and state (or state abbreviation). The city is any acceptable mailing name for the 5-digit ZIP Code serving the intended recipient as shown in the USPS City State Product.
e. ZIP Code where required:
1. ZIP Codes are required on Priority Mail Express, commercial First-Class Mail, First-Class Package Service, Periodicals, Standard Mail, Package Services and Parcel Select mailpieces, all mail sent to military addresses within the United States and to APO and FPO addresses, official mail, Business Reply Mail, and merchandise return service mail.
2. Unless required
above, ZIP Codes may be omitted from single-piece price First-Class Mail (including Priority Mail), single-piece price Standard Post, and pieces bearing a simplified address.
FOOTNOTE
Zip Code intentionally omitted: D.M.M. 602 1.3e(2)
"...ZIP Codes may be omitted from single-piece price First-Class Mail
(including Priority Mail), single-piece price Standard Post, and pieces bearing a simplified address.
http://pe.usps.com/text/dmm300/602.htm
