Trempealeau -- U.S. County in Wisconsin Population (2000): 27010 Housing Units (2000): 11482 Land area (2000): 734.082995 sq. miles (1901.266149 sq. km) Water area (2000): 7.901941 sq. miles (20.465932 sq. km) Total area (2000): 741.984936 sq. miles (1921.732081 sq. km) Located within: Wisconsin (WI), FIPS 55 Location: 44.315741 N, 91.350620 W Headwords: Trempealeau Trempealeau, WI Trempealeau County Trempealeau County, WI