Humacao, Puerto Rico, United States [ZonaUrbana]; population was 21,306 in 1990; housing units was 6,952 in 1990; location is 18°9'N 65°49'W; land area is 4.81 square miles (3,075 acres); water area is 0.02 square miles (15 acres); FIPS code is 35532 [SourceCBP]