Wailuku, Hawaii, United States [CDP]; population was 10,688 in 1990; housing units was 3,848 in 1990; location is 20°53'N 156°30'W; land area is 5.07 square miles (3,242 acres); water area is 0.37 square miles (239 acres); FIPS code is 77450 [SourceCBP]