Clark County /

Clark County is a county located in the state of Ohio, United States. As of 2010, the population was 133,333. It is included in the Springfield, Ohio Metropolitan Statistical Area. The county was established on March 1, 1818, and is named for General George Rogers Clark who fought Indians in Ohio in the late 18th century. Its county seat is Springfield. According to the U.S. Census Bureau, the county has a total area of 1,045 square kilometers (403 sq mi). 1,036 km (400 sq mi) of it is land and 10 km (4 sq mi) of it (0.92%) is water. As of the census of 2000, there were 144,742 people, 56,648 households, and 39,370 families residing in the county. The population density was 362 people per square mile (140/km²). There were 61,056 housing units at an average density of 153 per square mile (59/km²). The racial makeup of the county was 88.12% White, 8.95% Black or African American, 0.28% Native American, 0.53% Asian, 0.02% Pacific Islander, 0.53% from other races, and 1.58% from two or more races. 1.17% of the population were Hispanic or Latino of any race. 23.8% were of German, 21.6% American, 10.4% Irish and 8.7% English ancestry according to Census 2000. There were 56,648 households