White Rock is a town in Los Alamos County, New Mexico, United States. It is one of two population centers in the county known as census-designated places (CDPs); the other is Los Alamos (the county seat). The population was 6,045 at the 2000 census. It is largely a bedroom community for employees of Los Alamos National Laboratory and their families. Access to White Rock from the town of Los Alamos and other cities and towns in New Mexico is via New Mexico State Road 4, which forms the northwestern boundary of the community. Administratively, White Rock is a neighborhood of Los Alamos; locals refer to Los Alamos (meaning not White Rock) as "the Townsite," or "the Hill".