Washington County, Ohio
| Washington County, Ohio | |||
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Washington County Courthouse
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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 | 27 July, 1788 | ||
| Named for | George Washington | ||
| Seat | Marietta | ||
| Largest city | Marietta | ||
| Area | |||
| • Total | 640 sq mi (1,658 km2) | ||
| • Land | 632 sq mi (1,637 km2) | ||
| • Water | 8.0 sq mi (21 km2), 1.3% | ||
| Population | |||
| • (2010) | 61,778 | ||
| • Density | 98/sq mi (38/km²) | ||
| Congressional district | 6th | ||
| Time zone | Eastern: UTC-5/-4 | ||
| Website | www |
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Washington County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 61,778. Its county seat is Marietta. The county, the oldest in the state, is named for George Washington.
Washington County comprises the Marietta, OH Micropolitan Statistical Area, which is also included in the Parkersburg-Marietta-Vienna, WV-OH Combined Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 640 square miles (1,700 km2), of which 632 square miles (1,640 km2) is land and 8.0 square miles (21 km2) (1.3%) is water. It is the fifth-largest county in Ohio by land area.
Washington County's southern and eastern boundary is the Ohio River. The Muskingum River, Little Muskingum River, Duck Creek, and the Little Hocking River flow through the county to the Ohio River.
As of the census of 2000, there were 63,251 people, 25,137 households, and 17,671 families residing in the county. The population density was 100 people per square mile (38/km²). There were 27,760 housing units at an average density of 44 per square mile (17/km²). The racial makeup of the county was 97.33% White, 0.92% Black or African American, 0.24% Native American, 0.43% Asian, 0.05% Pacific Islander, 0.13% from other races, and 0.89% from two or more races. 0.51% of the population were Hispanic or Latino of any race. 29.5% were of German, 23.4% American, 12.3% English and 11.0% Irish ancestry according to Census 2000.
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