Johnston County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 168,878. Its county seat is Smithfield. Johnston County is included in the Raleigh, NC Metropolitan Statistical Area, which is also included in the Raleigh-Durham-Chapel Hill, NC Combined Statistical Area, which has a population of 1,998,808 as of U.S. Census 2012 Population Estimates.
According to the U.S. Census Bureau, the county has a total area of 796 square miles (2,060 km²), of which 791 square miles (2,050 km²) is land and 4.2 square miles (11 km²) (0.5%) is water.
As of the census of 2000, there were 121,965 people, 46,595 households, and 33,688 families residing in the county. The population density was 154 people per square mile (59/km²). There were 50,196 housing units at an average density of 63 per square mile (24/km²). The racial makeup of the county was 78.09% White, 15.65% Black or African American, 0.41% Native American, 0.30% Asian, 0.04% Pacific Islander, 4.53% from other races, and 0.99% from two or more races. 7.74% of the population were Hispanic or Latino of any race.
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