Garyville, Louisiana, United States [CDP]; population was 3,181 in 1990; housing units was 1,114 in 1990; location is 30°5'N 90°37'W; land area is 18.72 square miles (11,982 acres); water area is 1.46 square miles (933 acres); FIPS code is 28345 [SourceCBP]