Richland Parish (French: Paroisse de Richland) is a parish located in the U.S. state of Louisiana. The parish seat is Rayville. As of 2010, the population was 20,725. Richland Parish is home to the first parishwide public library in the State of Louisiana. The library was built in 1925.
The Lambda Kappa Club of Rayville established the library. R.R. Rhymes donated the original building in memory of his wife, Nonnie Roark Rhymes. In 2008, Governor Bobby Jindal appointed Bibb Ingram, a granddaughter to Nonnie Rhymes, as a member of the Louisiana State Library Board. The parish has a total area of 565 square miles (1,460 km2), of which, 558 square miles (1,450 km2) of it is land and 6 square miles (16 km2) of it (1.07%) is water.