LaSalle Parish is a parish located in the U.S. state of Louisiana. As of the 2020 United States Census, the population was 14,791. The parish seat is Jena. The parish was created in 1910 from the western section of Catahoula Parish.

Catahoula Parish is a parish in the U.S. state of Louisiana. As of the 2020 census, the population was 8,906. Its seat is Harrisonburg, on the Ouachita River. The parish was formed in 1808, shortly after the United States acquired this territory in the Louisiana Purchase of 1803.