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Publication 28 - Postal Addressing Standards >
2 Postal Addressing Standards > 22 Last Line of the Address > 225 Military Addresses
Overseas military addresses must contain the APO or FPO designation along with a two–character “state” abbreviation of AE, AP, or AA and the ZIP Code or ZIP+4 Code.
AE is used for armed forces in Europe, the Middle East, Africa, and Canada; AP is for the Pacific; and AA is the Americas excluding Canada.
Use only the approved city name as listed in the City State file, along with the two–character state abbreviation and the ZIP Code or ZIP+4 Code.