Black Rock is an unincorporated community and a census-designated place in McKinley County, New Mexico, United States. The population was 1,323 at the 2010 census. Black Rock is located on the Zuñi Reservation on the left bank of the Zuñi River, approximately four miles east of the town of Zuñi, on the north side of NM Route 53. Immediately to the e…Black Rock is an unincorporated community and a census-designated place in McKinley County, New Mexico, United States. The population was 1,323 at the 2010 census. Black Rock is located on the Zuñi Reservation on the left bank of the Zuñi River, approximately four miles east of the town of Zuñi, on the north side of NM Route 53. Immediately to the east of the community is the Black Rock Reservoir, which was created in 1908 by damming the Zuni River. The dam has undergone serious rebuilding three times since 1908, the most recent in the mid-1990s. Black Rock has a non-commercial airstrip built just after World War II, but not paved until 1970.