Warren is an unincorporated community and census-designated place in Columbia County, Oregon, United States, located on U.S. Route 30 north of Scappoose and south of St. Helens on Scappoose Bay of the Multnomah Channel. As of the 2010 census it had a population of 1,787.The Warren post office was established in 1885; it was named by local resident James Gill for his hometown of Warren, Massachusetts.