Mailing Standards of the United States Postal Service - International Mail Manual > 1 International Mail Services > 120 Preparation for Mailing > 122 Addressing
International destination addresses must comply with the standards in this section.
Note: In items c, d, and i, the term “full legal name” means the name that corresponds to the addressee’s government-issued identification — i.e., the addressee’s first name, middle initial (if applicable), and last name.
Example: Mr. Thomas Clark or Occupant
MR THOMAS CLARK117 RUSSELL DRIVELONDON W1P 6HQGREAT BRITAIN
MS CRISTINA CRUZAPARTADO 306846807 PUERTO VALLARTA JALISCOMEXICO
Exception: To Canada, there must be two spaces between the province abbreviation and the postal code, as shown below between “ON” and “K1A 0B1”:
MS HELEN SAUNDERS1010 CLEAR STREETOTTAWA ON K1A 0B1CANADA
The return address tells the U.S. Postal Service or foreign post where to return a mailpiece that cannot be delivered. Due to heightened security concerns, the U.S. Postal Service recommends a complete return address on all mailpieces — see 122.23 for when a return address is required. A mailpiece may include only one return address, and the mailer must place it so that it does not affect either the clarity of the address of destination or the application of service labels and notations (postmarks, etc.).
A complete return address must include the sender’s full legal name (see the Note in 122.1) and complete return address in roman letters and arabic numerals — it may not include just initials except where they are an adopted trade name.
In bulk mailings, all mailpieces must bear a U.S.-origin return address visible on the outside of the mailpiece. For the purpose of this section, a “bulk mailing” is any IPA or ISAL mailing, or any other mailing paid with an advance deposit account and presented to the U.S. Postal Service for acceptance. In addition, a return address is required for mailpieces bearing a customs form under 123.7.