Buena Vista -- U.S. County in Iowa Population (2000): 20411 Housing Units (2000): 8145 Land area (2000): 574.783868 sq. miles (1488.683322 sq. km) Water area (2000): 5.281204 sq. miles (13.678254 sq. km) Total area (2000): 580.065072 sq. miles (1502.361576 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.718568 N, 95.155185 W Headwords: Buena Vista Buena Vista, IA Buena Vista County Buena Vista County, IA