Rocklin, California, United States [City]; population was 19,033 in 1990; housing units was 7,559 in 1990; location is 38°48'N 121°14'W; land area is 12.61 square miles (8,069 acres); water area is 0.00 square miles (1 acres); FIPS code is 62364 [SourceCBP]