Oak Ridge is a town in northwestern Guilford County, North Carolina, United States. The population was 6,185 at the 2010 census, up from 3,988 at the 2000 census. As of 2015 the population had risen to an estimated 6,671. Oak Ridge is 15 miles northwest of the center of Greensboro, North Carolina's third-largest city, and it is a part of the Piedmont Triad urban area.