Warren -- U.S. County in Pennsylvania Population (2000): 43863 Housing Units (2000): 23058 Land area (2000): 883.446757 sq. miles (2288.116498 sq. km) Water area (2000): 14.362993 sq. miles (37.199979 sq. km) Total area (2000): 897.809750 sq. miles (2325.316477 sq. km) Located within: Pennsylvania (PA), FIPS 42 Location: 41.839439 N, 79.264052 W Headwords: Warren Warren, PA Warren County Warren County, PA