Great quiz, although not too many surprises. Paradise and Laramie were the only ones I didn't get on my first or second guess, but it was interesting to learn what the tallest buildings were. I think it would be even more interesting if you included the heights of the buildings. It wouldn't make the quiz easier or harder, but it would just be fun to compare the heights while trying to guess the cities.
Not enough time when the answers are clue specific as opposed to going through the states in your head and typing in the cities you know/think are on the list. Or maybe I'm just a slow typist.