'Butler County, IA' definitions:

Butler -- U.S. County in Iowa

From: Gazetteer 2000
Name :
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