SITUATION RULE: Required when the address is outside the United States of America. If not required by this implementation guide, do not send.
The below is a listing of territories of the United States of America; Is a country code "US" required for these places and if so what country code should be sent?
• American Samoa (AS)
• District of Columbia (DC)
• Guam (GU)
• Puerto Rico (PR)
• Virgin Islands (VI)
According to the United States Postal Service State Abbreviation List, these countries/territories are included as states. As such, they don't require that a country code be sent.
See external code Source:
22 States and Provinces
SIMPLE DATA ELEMENT/CODE REFERENCES
156, 66/SJ, 235/A5, 771/009
SOURCE
U.S. Postal Service or
Canada Post or
Bureau of Transportation Statistics