Garyville is a census-designated place located in St. John the Baptist Parish, Louisiana. As of the 2000 census, the CDP had a total population of 2,775. Garyville has the distinction of being the location of the most recent oil refinery built in the United States in 1976 by Marathon Petroleum Company. Garyville apartments for rent comparison page shows most up to date rent information on Garyville apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.