what county is st. helens, or in
For the mountain in Umatilla County, see Columbia Heights (Oregon). St. Helens is the county seat of Columbia County, Oregon. It was founded by Captain H. M. Knighton, a native of New England, in 1845 as Plymouth. The name was changed to St. Helens in the latter part of 1850 for its view of Mount St. Helens some 39 miles (63 km) away in Washington.