Raymondville is a city in and the county seat of Willacy County, Texas, United States. The population was 10,236 at the 2020 census. It may be included as part of the Brownsville–Harlingen–Raymondville and the Matamoros–Brownsville metropolitan areas. Raymondville was formed in 1904 by Edward Burleson Raymond, a foreman of the El Sauz Ranch portion of the King Ranch and owner of the Las Majadas Ranch.