DeRidder is a small city located in the U.S. state of Louisiana. It is within and the county seat of Beauregard County. It has a total area of 9.32 square miles at 30°51′05″N 93°17′25″W. The elevation is 203 feet above sea level. As of the 2010 census data, it had a total population of 10,578. The population density was 1,197.23/sq mi. It has Zip code 70634.