White Rock is a census-designated place (CDP) in Los Alamos County, New Mexico, United States. 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". According to the United States Census Bureau, the CDP has a total area of 7.2 square miles (19 Square Kilometer), all of it land.