Butler -- U.S. County in Iowa Population (2000): 15305 Housing Units (2000): 6578 Land area (2000): 580.378565 sq. miles (1503.173518 sq. km) Water area (2000): 1.180183 sq. miles (3.056661 sq. km) Total area (2000): 581.558748 sq. miles (1506.230179 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.735699 N, 92.781090 W Headwords: Butler Butler, IA Butler County Butler County, IA