Springfield, Ohio metropolitan area
| Clark County, Ohio | ||
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 Location in the U.S. state of Ohio |
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 Ohio's location in the U.S. |
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| Founded | March 1, 1818 | |
| Seat | Springfield | |
| Largest city | Springfield | |
| Area | ||
| • Total | 403 sq mi (1,044 km2) | |
| • Land | 397 sq mi (1,028 km2) | |
| • Water | 5.1 sq mi (13 km2), 1.3% | |
| Population | ||
| • (2010) | 138,333 | |
| • Density | 348/sq mi (134/km²) | |
| Congressional district | 8th | |
| Time zone | Eastern: UTC-5/-4 | |
| Website | www |
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Clark County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 138,333. Its county seat is Springfield. The county was created on March 1, 1818, and was named for General George Rogers Clark, a hero of the American Revolution.
Clark County comprises the Springfield, OH Metropolitan Statistical Area, which is also included in the Dayton-Springfield-Sidney-OH Combined Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 403 square miles (1,040 km2), of which 397 square miles (1,030 km2) is land and 5.1 square miles (13 km2) (1.3%) is water. It is the third-smallest county in Ohio by total area.
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.
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