Lafourche Parish (French: Paroisse de la Fourche) is a parish located in the south of the U.S. state of Louisiana. As of the 2010 census, the population was 96,318. The parish seat is Thibodaux. The parish was formed in 1807. It was originally the northern part of Lafourche Interior Parish, which consisted of the present parishes of Lafourche and Terrebonne.