What is the only letter that does not appear in any of the names of the american states?

The only letter that does not appear in any of the names of the American states is the letter "Q." There is no state in the United States that contains the letter "Q" in its name. Some other less common letters, such as "X" and "Z," appear in the names of a few states, but "Q" is completely absent. Despite this absence, the letter "Q" is still used in various other contexts, such as names of cities, rivers, and landmarks throughout the country.