Washington -- U.S. County in Florida Population (2000): 20973 Housing Units (2000): 9503 Land area (2000): 579.929160 sq. miles (1502.009565 sq. km) Water area (2000): 35.860558 sq. miles (92.878415 sq. km) Total area (2000): 615.789718 sq. miles (1594.887980 sq. km) Located within: Florida (FL), FIPS 12 Location: 30.630591 N, 85.638396 W Headwords: Washington Washington, FL Washington County Washington County, FL