So I did not specify that you needed to have tone marks in your submission (because a word with the same spelling/different tone can mean something completely different in Chinese). Unfortunately, this means that words with identical spellings will be counted as non-unique, even if they have different tones. I realize this isn't the most accurate thing to do, and I apologize.
The invalid answers are provinces/districts, except for Queenstown, Australia, which has less than 2,000 people, and Quick, Nebraska, which isn't a town/city according to my research.