Columbia County, Washington

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Columbia County is a county located in the U.S. state of Washington. As of 2000, the population was 4,064. 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.[1]



According to the U.S. Census Bureau, the county has a total area of 874 square miles (2,263.6 km2), of which 869 square miles (2,250.7 km2) is land and 5 square miles (12.9 km2) (0.54%) is water. It is part of the Palouse, a wide and rolling prairie-like region of the middle Columbia basin.

Geographic features

Major highways

Adjacent counties

National protected area

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