Johnson -- U.S. County in Arkansas Population (2000): 22781 Housing Units (2000): 9926 Land area (2000): 662.168234 sq. miles (1715.007779 sq. km) Water area (2000): 20.574775 sq. miles (53.288421 sq. km) Total area (2000): 682.743009 sq. miles (1768.296200 sq. km) Located within: Arkansas (AR), FIPS 05 Location: 35.498657 N, 93.484633 W Headwords: Johnson Johnson, AR Johnson County Johnson County, AR