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Columbia County, Washington

US county information
NameColumbia County
US Area
Total Area874 sq mi (2263.7 km2)
Land Area869 sq mi (2250.7 km2)
Water Area5 sq mi (13 km2)
Population4078 (2010)
Density2/km2 (5.2/sq mi)
FoundedNovember 11, 1875

     Home | County | Columbia County Washington

Columbia County is a county located in the U.S. state of Washington. As of 2010, the population was 4,078. The county seat is at Dayton, which is also the county's largest city. It is named after the Columbia River.

Columbia County was created out of Walla Walla County on November 11, 1875.

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