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 in 2000. As of 2018, the population had risen to an estimated 6,977. 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.