city, western suburb of Milwaukee, Milwaukee county, southeastern Wisconsin, U.S. It is situated just south of Wauwatosa. Potawatomi and Menominee Indians were among the early inhabitants of the region. In 1835 settlers from New York arrived and began farming along Honey Creek, for which the community was initially named. The growing Milwaukee area provided a market for the agricultural produce. The Chicago and North Western Railway reached the community in 1880 and called its station North Greenfield; in 1887 the community took the same name. The city's growth was spurred by the siting within its boundaries in 1891 of the annual Wisconsin State Fair and by the arrival of streetcar lines from Milwaukee in 1894. It became an industrial centre; in 1902, after the arrival of the Edward P. Allis Company (manufacturers of heavy machinery), the city was renamed West Allis.

Manufacturing (engines, metal products, and machinery) and services are the city's economic mainstays. The state fair is held annually in August, and other events are staged on the fairgrounds throughout the year. The Milwaukee County Zoo is on the city's northern border. Inc. 1906. Pop. (1990) 63,221; (2000) 61,254.