Picayune, Mississippi, United States [City]; population was 10,633 in 1990; housing units was 4,322 in 1990; location is 30°32'N 89°41'W; land area is 11.83 square miles (7,571 acres); water area is 0.05 square miles (35 acres); FIPS code is 57160 [SourceCBP]