Casa Blanca is a census-designated place (CDP) in Pinal County, Arizona, United States, located in the Gila River Indian Community.

Casa Blanca, formerly known to the Mexicans as La Tierra Amontonada (The Land Piled Up), named for the Hohokam ruin mound nearby, was one of the Pima Villages on the Gila River in what was then part of the state of Sonora, Mexico.

[4] The next year another official census was taken by the special Indian Agent that showed Casa Blanca had 491 Pimas, broken down as 50 Aged, 146 Men, 103 Women, 105 Boys, 87 Girls, led by Captain Candela.

[9] In 1860, the census showed fifteen European Americans at Casa Blanca who were part of Ammi M. White's enterprise there.

White & Co. had taken over the buildings of St.John's Indian agency, (after his resignation from that post in late 1859), which included a blacksmith shop, run by Noyes.

Led by Captain Sherod Hunter, the raid destroyed the mill machinery, captured Ammi White and returned the flour and other food to the Pima.

Once the California Column arrived they found they had to wait to gather up flour and food to continue their march to Tucson and so they built Fort Barrett around the mill to protect their depot there.