Richland Parish is a parish located in the North Louisiana Delta Country in the U.S. state of Louisiana, known for its fertile, flat farmland, cane brakes, and open spaces. The parish had a population of 20,043 at the 2020 United States census. The name Richland was chosen due to the rich production from farming. The parish seat and largest community is R…Richland Parish is a parish located in the North Louisiana Delta Country in the U.S. state of Louisiana, known for its fertile, flat farmland, cane brakes, and open spaces. The parish had a population of 20,043 at the 2020 United States census. The name Richland was chosen due to the rich production from farming. The parish seat and largest community is Rayville.