Hauula, Hawaii, United States [CDP]; population was 3,479 in 1990; housing units was 1,021 in 1990; location is 21°35'N 157°55'W; land area is 6.01 square miles (3,846 acres); water area is 0.79 square miles (506 acres); FIPS code is 12400 [SourceCBP]