Big Pine Key, Florida, United States [CDP]; population was 4,206 in 1990; housing units was 2,453 in 1990; location is 24°41'N 81°22'W; land area is 9.76 square miles (6,243 acres); water area is 0.19 square miles (124 acres); FIPS code is 6425 [SourceCBP]