Columbia County Oregon Cities/Towns - Clatskanie, Columbia City, Deer Island, Goble, Marshland, Milton, Mist, Prescott, Rainier, Scappoose, St. Helens (County Seat), Vernonia, Warren

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Columbia County is a county located in the U.S. state of Oregon. As of 2016, its population was 50,785. The county seat is St. Helens.
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It was named for the Columbia River, which forms its eastern and northern borders.

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