Red River Parish is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 7,620, making it the fourth-least populous parish in Louisiana. The parish seat and most populous municipality is Coushatta. It is one of the newer parishes, created in 1871 by the state legislature from parts of Bienville, Bossier, Caddo, Desoto and Natchitoches Parishes under Reconstruction. The plantation economy was based on cotton cultivation, highly dependent on enslaved African labor before the American Civil War.

Bienville Parish is a parish located in the northwestern portion of the U.S. state of Louisiana. At the 2020 census, the population was 12,981. The parish seat and most populous municipality is Arcadia.