Johnston -- U.S. County in North Carolina Population (2000): 121965 Housing Units (2000): 50196 Land area (2000): 791.854661 sq. miles (2050.894069 sq. km) Water area (2000): 3.939151 sq. miles (10.202355 sq. km) Total area (2000): 795.793812 sq. miles (2061.096424 sq. km) Located within: North Carolina (NC), FIPS 37 Location: 35.526190 N, 78.368467 W Headwords: Johnston Johnston, NC Johnston County Johnston County, NC