U.S. Geography

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

More Questions from U.S. Geography
Which river forms part of the border between Alabama and Georgia?
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Where is the longest running jazz festival in the world held every September?
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Nebraska was once called the "Great American" what?
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Which South Carolina city did the British fail to conquer in a 1776 battle?
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Which of these states has the largest land area?
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Where is Jones Beach State Park located?
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What U.S. state, known as the "Valentine State", was admitted to the union on February 14?
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What is the name of the island located in Oregon's Crater Lake?
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