The U.S. state of Arizona has 15 counties. Explore list of Arizona Counties and County Seats in alphabetical order and check their population, areas and the date of formation.
List of Arizona Counties and County Seat
| County | County Seat | Population (2011) | Area | Formed |
|---|
| Apache County | St. Johns | 69,980 | 11,218 sq mi | 1879 |
| Cochise County | Bisbee | 127,866 | 6,219 sq mi | 1881 |
| Coconino County | Flagstaff | 134,421 | 18,661 sq mi | 1891 |
| Gila County | Globe | 51,994 | 4,796 sq mi | 1881 |
| Graham County | Safford | 34,769 | 4,641 sq mi | 1881 |
| Greenlee County | Clifton | 7,754 | 1,848 sq mi | 1909 |
| La Paz County | Parker | 20,172 | 4,513 sq mi | 1983 |
| Maricopa County | Phoenix | 3,990,181 | 9,224 sq mi | 1871 |
| Mohave County | Kingman | 194,944 | 13,470 sq mi | 1864 |
| Navajo County | Holbrook | 111,273 | 9,959 sq mi | 1895 |
| Pima County | Tucson | 1,003,235 | 9,189 sq mi | 1864 |
| Pinal County | Florence | 324,962 | 5,374 sq mi | 1875 |
| Santa Cruz County | Nogales | 42,845 | 1,238 sq mi | 1899 |
| Yavapai County | Prescott | 212,635 | 8,128 sq mi | 1864 |
| Yuma County | Yuma | 190,557 | 5,519 sq mi | 1864 |
