✉️ USPS CODES

Colorado · USPS Abbreviation

Launch the USPS Abbreviation mini-game with Colorado as the first prompt. Quick facts and links below.

Play the full game now

Colorado's 2-letter postal abbreviation

Play the full game now →
CO is the official USPS 2-letter abbreviation for Colorado. This page launches the USPS Abbreviations quiz starting with CO — match the code to the state.

Why CO?

The USPS standardized state abbreviations to 2 letters in 1963 to fit punched cards in early mail-sorting machines. The code CO takes the first 1 or 2 distinctive letters of Colorado.

Quick facts

USPS code
CO
Capital
Denver
Largest city
Denver
Region
West
Admitted to Union
1876
Nickname
Centennial State
Electoral votes
10
Bordering states
Arizona, Kansas, Nebraska, New Mexico, Oklahoma, Utah, Wyoming

Other Colorado games

→ Colorado · Place the State→ Colorado · State Capitals Quiz→ Colorado · State Flag Quiz→ Colorado · State Nickname Quiz

More about Colorado

→ Colorado state page → Learn the 50 US states → All US states games

Frequently asked

What is Colorado's abbreviation?

CO.

Is this game free?

Yes — 100% free, no signup, no ads. Just play.

Can I play other Colorado quizzes?

Yes — see the sibling games above. Colorado appears in every Statedoku mini-game.