Red River Parish (French: Paroisse de la Rivière-Rouge) is a parish located in the U.S. state of Louisiana. As of the 2010 census, the population was 9,091, making it the fourth-least populous parish in Louisiana. Its seat is Coushatta. It was one of the newer parishes created in 1871 by the state legislature under Reconstruction. The plantation economy was based on cotton cultivation, highly dependent on enslaved labor before the American Civil War.