| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pinal County | 1 | 32.21% | 568,796 | 430,213 |
| Yuma County | 2 | 11.85% | 230,034 | 205,665 |
| Santa Cruz County | 3 | 9.47% | 52,230 | 47,712 |
| Yavapai County | 4 | 8.35% | 257,041 | 237,228 |
| Mohave County | 5 | 8.25% | 231,835 | 214,173 |
| Maricopa County | 6 | 7.71% | 4,788,038 | 4,445,415 |
| Graham County | 7 | 7.7% | 41,604 | 38,630 |
| Pima County | 8 | 5.55% | 1,103,289 | 1,045,227 |
| La Paz County | 9 | 4.7% | 17,352 | 16,573 |
| Navajo County | 10 | 3.01% | 109,986 | 106,773 |
| Cochise County | 11 | 1.61% | 127,557 | 125,533 |
| Gila County | 12 | 1.39% | 54,099 | 53,355 |
| Coconino County | 13 | 0.29% | 145,615 | 145,190 |
| Greenlee County | 14 | -0.7% | 9,464 | 9,531 |
| Apache County | 15 | -2.67% | 64,158 | 65,917 |
Arizona's counties show varied growth patterns from 2020 to 2026. Pinal County leads with 4.76% annualized growth, followed by Yuma County (1.88%) and Santa Cruz County (1.52%). The largest counties are Maricopa County (4,788,038), Pima County (1,103,289), and Pinal County (568,796). Of the 15 counties in Arizona, 13 are growing while 2 have experienced population decline. Overall, counties averaged 1.03% annualized growth, with total population growing by 1.38% annually.
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