St. Mary Parish is a parish located in the U.S. state of Louisiana. As of the 2010 census, the population was 54,650. The parish seat is Franklin. The parish was created in 1811. St. Mary Parish comprises the Morgan City, LA Micropolitan Statistical Area, which is also included in the Lafayette-Opelousas-Morgan City, LA Combined Statistical Area.

St. Mary Parish (French: Paroisse de Sainte-Marie) is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 49,406.[1] The parish seat is Franklin.[2] The parish was created in 1811.[3]

St. Mary Parish comprises the Morgan City, LA Micropolitan Statistical Area, which is also included in the Lafayette–Opelousas–Morgan City combined statistical area.

Geography
According to the U.S. Census Bureau, the parish has a total area of 1,119 square miles (2,900 km2), of which 555 square miles (1,440 km2) is land and 564 square miles (1,460 km2) (50%) is water.[4] Cypremort Point State Park is located in the parish on