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. The population was 12,883 at the 2010 census.
St. Helens was established as a river port on the...