- Apache
- Cochise
- Coconino
- Gila
- Graham
- Greenlee
- La Paz
- Maricopa
- Mohave
- Navajo
- Pima
- Pinal
- Santa Cruz
- Yavapai
- Yuma
Each of these counties serves as an important administrative region within the state.
Each of these counties serves as an important administrative region within the state.