Columbia County, Washington
| Columbia County, Washington | |
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Columbia County Courthouse
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 Location in the U.S. state of Washington |
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 Washington's location in the U.S. |
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| Founded | November 11, 1875 |
| Named for | Columbia River |
| Seat | Dayton |
| Largest city | Dayton |
| Area | |
| • Total | 873 sq mi (2,261 km2) |
| • Land | 869 sq mi (2,251 km2) |
| • Water | 4.9 sq mi (13 km2), 0.6% |
| Population (est.) | |
| • (2015) | 3,944 |
| • Density | 4.6/sq mi (2/km²) |
| Congressional district | 5th |
| Time zone | Pacific: UTC-8/-7 |
| Website | www |
Columbia County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 4,078, making it the third-least populous county in Washington. The county seat and largest city is Dayton. The county was created out of Walla Walla County on November 11, 1875 and is named after the Columbia River.
Columbia County is included in the Walla Walla, WA Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 873 square miles (2,260 km2), of which 869 square miles (2,250 km2) is land and 4.9 square miles (13 km2) (0.6%) is water. It is part of the Palouse, a wide and rolling prairie-like region of the middle Columbia basin.
As of the census of 2000, there were 4,064 people, 1,687 households, and 1,138 families residing in the county. The population density was 5 people per square mile (2/km²). There were 2,018 housing units at an average density of 2 per square mile (1/km²). The racial makeup of the county was 93.73% White, 0.22% Black or African American, 0.96% Native American, 0.42% Asian, 0.05% Pacific Islander, 2.73% from other races, and 1.89% from two or more races. 6.35% of the population were Hispanic or Latino of any race. 19.6% were of German, 18.2% United States or American, 14.3% English and 8.3% Irish ancestry. 94.3% spoke English and 5.7% Spanish at home.
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