US postal abbreviationsThe United States Postal Service uses two-letter abbreviations for the U.S. states and territories of the US, as specified below. For other purposes as well, they are frequently used. Canada Post also recognizes these postal abbreviations.
The following abbreviations for the Canadian provinces and territories, used by Canada Post, are also recognized:
Each of these is also used in domain names, such as vancouver.bc.ca and seattle.wa.us.
Other abbreviations used by the US postal service: