Waterloo is a city in Jefferson County in the U.S. state of Wisconsin. As of the census of 2022, the population was 3,628. The name Waterloo w…Waterloo is a city in Jefferson County in the U.S. state of Wisconsin. As of the census of 2022, the population was 3,628. The name Waterloo was suggested by Mr. Wilt, a Frenchman living here, who was one of Napoleon's soldiers, at the battle of Waterloo. Waterloo is located in the Watertown-Fort Atkinson micropolitan area which is a sub-market of the larger Milwaukee-Racine-Waukesha CSA.
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