Terrebonne Parish is a parish located in the southern part of the U.S. state of Louisiana. At the 2020 census, the population was 109,580. The parish seat is Houma. The parish was founded in 1822. Terrebonne Parish is part of the Houma-Thibodaux metropolitan statistical area. It is the fifth-largest parish in the state in terms of land area, and it has been a center of Cajun culture since the 18th century. More than 10% of its residents speak French at home.