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Columbia County, Oregon

US county information
NameColumbia County
SeatSt. Helens
US Area
Total Area688 sq mi (1781.9 km2)
Land Area657 sq mi (1701.6 km2)
Water Area32 sq mi (82.9 km2)
Population49351 (2010)
Density28.9/km2 (74.9/sq mi)
Founded16 January 1854

     Home | County | Columbia County Oregon

Columbia County is a county located in the U.S. state of Oregon. It was named for the Columbia River, which forms its eastern and northern borders. As of 2010, its population was 49,351. The county seat is St. Helens.

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