USPS Official Postal Service Abbreviations
Listings of official U.S. postal state abbreviations, street suffixes, and secondary unit designators, from the U.S. Postal Service.
State Abbreviations (Text File)
Quick reference to the two-letter abbreviation for each U.S. State, from Alaska to Wyoming. In .txt format, from the U.S. Postal Service.
State Abbreviations and Capitals
Table of state postal abbreviations, standard abbreviations, and capital cities, with links to the official government site for each state.
50 States.com: State Abbreviations
List of postal abbreviations for U.S. states and territories, with links to reference information about each region.
State Abbreviations and State Capitals
U.S. postal service state abbreviations, old-fashioned abbreviations, as well as links to government sites for the U.S. military, states, and Canadian provinces.
About.com: State Abbreviations
Quick reference to U.S. state abbreviations and postal codes, as well as Canadian postal codes.
Cheat sheet of state abbreviations and postal codes, organized in a-b-c order and searchable by letter.
UC Style Guide: State Abbreviations
Style guide for state abbreviations and how to use them in mailing addresses, lists, tables, and congress member IDs.