The Roman Catholic Diocese of Tucson (Latin: Dioecesis Tucsonensis) is an ecclesiastical territory or diocese of the Roman Catholic Church in the southwestern region of the United States. It comprises nine counties of the state of Arizona making it the fifth largest diocese in the continental United States in terms of area. The counties are Gila Graham Greenlee Pinal (excluding the territorial boundaries of the Gila River Indian Reservation) Cochise Santa Cruz Pima Yuma and La Paz.
Cochise County Arizona, Gila County Arizona, Graham County Arizona, Greenlee County Arizona, La Paz County Arizona, Pima County Arizona, Pinal County Arizona, Santa Cruz County Arizona, Yuma County Arizona, Arizona
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