Jackson Parish is a parish in the northern part of the U.S. state of Louisiana. As of the 2020 census, the population was 15,031. The parish seat is Jonesboro. The parish was formed in 1845 from parts of Claiborne, Ouachita, and Union Parishes. In the twentieth century, this part of the state had several small industrial mill towns, such as Jonesboro.

Winn Parish is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 13,755. Its seat and largest city is Winnfield. The parish was founded in 1852. It is last in alphabetical order of Louisiana's sixty-four parishes. Winn is separated from Natchitoches Parish along U.S. Highway 71 by Saline Bayou, the first blackwater protected waterway in the American South.