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Alto, Texas. Alto is a town in Cherokee County, Texas, United States. The population was 1,225 at the 2010 census. Alto is the closest municipality to the Caddo Mounds State Historic Site, an archaeological site dating back to 800 CE, featuring a prehistoric village and ceremonial center.
Visit Historic Alto, Texas and the Caddoan Indian. Mounds On the El Camino Real de los Tejas. History on Caddoan Indians