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