Weslaco Independent School District is a school district headquartered in Weslaco, Texas (USA). WISD serves the city of Weslaco, a western portion of the city of Mercedes, and several unincorporated communities in Hidalgo County. This includes much of Midway South (sections east of South Midway Road), a portion of Midway North, Villa Verde, Olivarez, Llano Grande, and the WISD part of Mila Doce.