The Hawaiian alphabet consists of only twelve letters:

A, E, H, I, K, L, M, N, O, P, U, and W

Can you think of a nine-letter U.S. city with a population of 1.5 million whose name is made up entirely of Hawaiian letters, and is also in a state whose postal abbreviation is made up of two Hawaiian letters? Hint: The city is not in Hawaii.

Answer: 

MILWAUKEE, WI