| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pinal County | 1 | 30.87% | 563,034 | 430,231 |
| Yuma County | 2 | 10.65% | 227,510 | 205,618 |
| Mohave County | 3 | 7.37% | 229,942 | 214,167 |
| Yavapai County | 4 | 7.03% | 253,908 | 237,223 |
| Maricopa County | 5 | 6.3% | 4,724,969 | 4,445,025 |
| Santa Cruz County | 6 | 5.37% | 50,275 | 47,711 |
| Graham County | 7 | 3.75% | 40,075 | 38,626 |
| Navajo County | 8 | 3.35% | 110,329 | 106,748 |
| Pima County | 9 | 2.93% | 1,075,914 | 1,045,245 |
| Cochise County | 10 | 1.54% | 127,465 | 125,527 |
| La Paz County | 11 | 1.15% | 16,752 | 16,562 |
| Gila County | 12 | 0.26% | 53,476 | 53,338 |
| Coconino County | 13 | -0.76% | 144,078 | 145,182 |
| Greenlee County | 14 | -2.53% | 9,290 | 9,531 |
| Apache County | 15 | -2.61% | 64,195 | 65,913 |
Arizona's counties show varied growth patterns from 2020 to 2026. Pinal County leads with 4.59% annualized growth, followed by Yuma County (1.7%) and Mohave County (1.19%). The largest counties are Maricopa County (4,724,969), Pima County (1,075,914), and Pinal County (563,034). Of the 15 counties in Arizona, 12 are growing while 3 have experienced population decline. Overall, counties averaged 0.78% annualized growth, with total population growing by 1.14% annually.
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