STATE ยท AZ
Counties in Arizona
Arizona has 15 counties and county equivalents. The most populous is Maricopa County with 4,585,871 people (Census 2023 estimate).
| County | Type | FIPS | Population (2023) |
|---|---|---|---|
| Apache County | county | 04001 | 65,036 |
| Cochise County | county | 04003 | 124,640 |
| Coconino County | county | 04005 | 144,472 |
| Gila County | county | 04007 | 54,003 |
| Graham County | county | 04009 | 39,525 |
| Greenlee County | county | 04011 | 9,369 |
| La Paz County | county | 04012 | 16,710 |
| Maricopa County | county | 04013 | 4,585,871 |
| Mohave County | county | 04015 | 223,682 |
| Navajo County | county | 04017 | 109,175 |
| Pima County | county | 04019 | 1,063,162 |
| Pinal County | county | 04021 | 484,239 |
| Santa Cruz County | county | 04023 | 49,158 |
| Yavapai County | county | 04025 | 249,081 |
| Yuma County | county | 04027 | 213,221 |
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27. Looking for yours? Find your county.