Plantation Key, Florida, United States [CDP]; population was 4,405 in 1990; housing units was 2,961 in 1990; location is 24°59'N 80°34'W; land area is 3.24 square miles (2,076 acres); water area is 6.48 square miles (4,146 acres); FIPS code is 57512 [SourceCBP]