| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pinal County | 1 | 25.83% | 541,329 | 430,213 |
| Yuma County | 2 | 9.48% | 225,172 | 205,665 |
| Santa Cruz County | 3 | 7.66% | 51,369 | 47,712 |
| Yavapai County | 4 | 7.29% | 254,527 | 237,228 |
| Mohave County | 5 | 7% | 229,157 | 214,173 |
| Maricopa County | 6 | 6.41% | 4,730,567 | 4,445,415 |
| Graham County | 7 | 5.94% | 40,923 | 38,630 |
| Pima County | 8 | 4.45% | 1,091,719 | 1,045,227 |
| La Paz County | 9 | 3.61% | 17,172 | 16,573 |
| Navajo County | 10 | 2.79% | 109,751 | 106,773 |
| Gila County | 11 | 1.37% | 54,086 | 53,355 |
| Cochise County | 12 | 0.9% | 126,665 | 125,533 |
| Coconino County | 13 | 0.14% | 145,388 | 145,190 |
| Greenlee County | 14 | -0.99% | 9,437 | 9,531 |
| Apache County | 15 | -2.18% | 64,479 | 65,917 |
Arizona's counties show varied growth patterns from 2020 to 2025. Pinal County leads with 25.83% annualized growth, followed by Yuma County (9.48%) and Santa Cruz County (7.66%). The largest counties are Maricopa County (4,730,567), Pima County (1,091,719), and Pinal County (541,329). Of the 15 counties in Arizona, 13 are growing while 2 have experienced population decline. Overall, counties averaged 5.31% annualized growth, with total population growing by 7.02% annually.
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