Bayou L'Ourse is a census-designated place (CDP) in Assumption Parish, Louisiana, United States. The population was 1,978 at the 2010 census.GeographyBayou L'Ourse is located at, at the intersection of Louisiana Highway 662 and LA 398. It is east of Morgan City and west of Thibodaux.According to the United States Census Bureau, the CDP has a total area of 7.1sqkm, all land.