West Allis is a city in Milwaukee County, Wisconsin, United States. It is part of the Milwaukee metropolitan area. The population was 61,254 at the 2000 census. Its name derives from Edward P. Allis, who started the Allis-Chalmers Manufacturing Company in the 19th century. The site of the town was located west of Allis' plant. The Wisconsin State Fair Park, which includes the Milwaukee Mile and is the site of the annual Wisconsin State Fair, is located in West Allis.

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