Willacy County is a county in the U.S. state of Texas. As of the 2020 census, its population was 20,164. Its county seat is Raymondville. The county was created in 1911 and organized the next year.

Raymondville is a city in and the county seat of Willacy County, Texas, United States. The population was 11,284 at the 2010 census. It may be included as part of the Brownsville–Harlingen–Raymondville and the Matamoros–Brownsville metropolitan areas.