|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.
It was named for the Columbia River, which forms its eastern and northern borders.