South Valley, New Mexico, United States [CDP]; population was 35,701 in 1990; housing units was 12,226 in 1990; location is 35°1'N 106°41'W; land area is 30.50 square miles (19,520 acres); water area is 0.71 square miles (453 acres); FIPS code is 74520 [SourceCBP]