West Allis is a city in Milwaukee County, Wisconsin, United States. A suburb of Milwaukee, it is part of the Milwaukee metropolitan area. The population was 60,325 at the 2020 census, making it the eleventh-most populous city in Wisconsin.

Milwaukee County is located in the U.S. state of Wisconsin. At the 2020 census, the population was 939,489, down from 947,735 in 2010. It is both the most populous and most densely populated county in Wisconsin, and the 45th most populous county nationwide; Milwaukee, its eponymous county seat, is also the most populous city in the state. The county was created in 1834 as part of Michigan Territory and organized the following year.