Bluefield is a city in Mercer County, West Virginia, United States. The population was 10,447 at the 2010 census. Bluefield is located at 37°15′44″N 81°13′7″W / 37.26222°N 81.21861°W (37.262219, -81.218674) in the Appalachian Mountains of West Virginia across the state border from Bluefield, Virginia.