Uvalde County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 26,405. Its county seat is Uvalde. The county was created in 1850 and organized in 1856. It is named for Juan de Ugalde, the Spanish governor of Coahuila. Uvalde County was founded by Reading Wood Black who also founded the city of Uvalde, Texas.