Category I-A

These countries or regions have rigorous testing and a postal certification process that results in the largest amount and greatest accuracy of postal data.
Category I-A Country or Region and Territory Postal System
Country or Region
Code
Australia
AU
Canada
CA
United States
Includes:
  • American Samoa [AS]
  • Federated States of Micronesia [FM]
  • Guam [GU]
  • Marshall Islands [MH]
  • Northern Mariana Islands [MP]
  • Palau [PW]
  • Puerto Rico [PR]
  • Virgin Islands [VI] US
US