Aguadilla, Puerto Rico, United States [ZonaUrbana]; population was 18,347 in 1990; housing units was 6,882 in 1990; location is 18°26'N 67°9'W; land area is 2.58 square miles (1,652 acres); water area is 0.57 square miles (367 acres); FIPS code is 745 [SourceCBP]