Mather AFB, California, United States [CDP]; population was 4,885 in 1990; housing units was 1,279 in 1990; location is 38°33'N 121°17'W; land area is 9.56 square miles (6,121 acres); water area is 0.03 square miles (16 acres); FIPS code is 46254 [SourceCBP]