U.S. Geography

What is the two-letter postal abbreviation for the state of Colorado?

More Questions from U.S. Geography
What year was the popular 24 hour L.A. breakfast place, The Original Pantry Cafe opened?
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Where in South Dakota was gold discovered in 1874?
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In which state is the Magnolia both the state flower and state tree?
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Which university is located in Rhode Island?
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What is the state bird of California?
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Who were the first inhabitants of Montana?
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Which U.S. state has "The Last Frontier" as its nickname?
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In what region of the U.S. is Alabama located?
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