Mangham is a village in Richland Parish in northeastern Louisiana, United States. The population was 672 at the 2010 census. Mangham was established in 1890. It is named for Wiley P. Mangham, the publisher of the Richland Beacon-News, a weekly newspaper in Rayville, the seat of Richland Parish.

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.