Bluewell, West Virginia is an unincorporated census-designated place on U.S. Route 52 in Mercer County, West Virginia, United States. As of t…Bluewell, West Virginia is an unincorporated census-designated place on U.S. Route 52 in Mercer County, West Virginia, United States. As of the 2010 census, its population is 2,184. It is the terminus of West Virginia Route 20.