Mequon is a city in Ozaukee County, Wisconsin, United States. It had a population of 21,823 at the 2000 census, and an estimated population of 23,739 in July 2009. The mayor is Curt Gielow. In July 2005, CNN's Money Magazine listed Mequon 19th among its 100 Best Small Cities in the United States, ranked jointly with Thiensville, a village completely surrounded by Mequon.

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