Muskego, WI -- U.S. city in Wisconsin Population (2000): 21397 Housing Units (2000): 7699 Land area (2000): 31.225297 sq. miles (80.873145 sq. km) Water area (2000): 4.656207 sq. miles (12.059521 sq. km) Total area (2000): 35.881504 sq. miles (92.932666 sq. km) FIPS code: 55275 Located within: Wisconsin (WI), FIPS 55 Location: 42.901235 N, 88.124640 W ZIP Codes (1990): 53150 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Muskego, WI Muskego