Washington -- U.S. County in Arkansas Population (2000): 157715 Housing Units (2000): 64330 Land area (2000): 949.717241 sq. miles (2459.756258 sq. km) Water area (2000): 6.292250 sq. miles (16.296853 sq. km) Total area (2000): 956.009491 sq. miles (2476.053111 sq. km) Located within: Arkansas (AR), FIPS 05 Location: 36.051379 N, 94.198684 W Headwords: Washington Washington, AR Washington County Washington County, AR