Vernonia is a city in Columbia County, Oregon, United States. It is located on the Nehalem River, in a valley on the eastern side of the Northern Oregon Coast Range that is the heart of one of the most important timber-producing areas of the state. Logging has played a large role in the history of the city. The population was 2,151 at the 2010 census.

Oregon Route 47 is an Oregon state highway that runs between the Willamette Valley, near McMinnville, and the city of Clatskanie, along the Columbia River in the northwest part of the state. OR 47 traverses several highways of the Oregon state highway system: part of the Tualatin Valley Highway No. 29, part of the Nehalem Highway No. 102, part of the Sunset Highway No. 47, and the Mist–Clatskanie Highway No. 110.