Counties of Arizona
| Counties of Arizona | |
|---|---|
| Category | Federal Unit |
| Location | State of Arizona |
| Number | 15 |
| Populations | 7,754 (Greenlee) – 3,990,181 (Maricopa) |
| Areas | 1,238 square miles (3,210 km2) (Santa Cruz) – 18,661 square miles (48,330 km2) (Coconino) |
| Government | County government |
| Subdivisions | cities, towns, unincorporated communities, census designated place |
There are 15 counties in the U.S. state of Arizona. Four counties (Mohave, Pima, Yavapai and Yuma) were created in 1864 following the organization of the Arizona Territory in 1862. The now defunct Pah-Ute County was split from Mohave County in 1865, but merged back in 1871. All but La Paz County were created by the time Arizona was granted statehood in 1912.
Eight of Arizona's fifteen counties are named after various Native American groups that are resident in parts of what is now Arizona, with another (Cochise County) being named after a native leader. Four other counties, Gila County, Santa Cruz County, Pinal County, and Graham County, are named for physical features of Arizona's landscape: the Gila River, the Santa Cruz River, Pinal Peak, and Mount Graham, respectively. Another county, La Paz County, is named after a former settlement, while the final county, Greenlee County, is named after one of the state's early pioneers.
Under Arizona laws, a county shall not be formed or divided by county initiative unless each proposed county would have all of the following characteristics: (1) at least three-fourths of one percent of the total state assessed valuation and at least the statewide per capita assessed valuation; (2) a population of at least three-fourths of one percent of the total state population according to the most recent United States decennial census; (3) at least one hundred square miles of privately owned land; (4) common boundaries with either (a) at least three other existing or proposed counties; or (b) at least two other existing or proposed counties and the state boundary. A county formation commission is required to be formed to evaluate the feasibility of the proposed county. A proposal to divide a county must be approved by a majority of the votes cast in each proposed new county.
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