Arizona Counties by Population (2026)
2026 Pop.
500K
1M
1.5M
2M
2.5M
3M
3.5M
4M
4.5M
Top 5 Most Populous Counties
4,724,969
1,075,914
563,034
253,908
229,942
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| Maricopa County | 4,724,969 | 9.2K | 513 | 6.3% |
| Pima County | 1,075,914 | 9.2K | 117 | 2.93% |
| Pinal County | 563,034 | 5.4K | 105 | 30.87% |
| Yavapai County | 253,908 | 8.1K | 31 | 7.03% |
| Mohave County | 229,942 | 13.3K | 17 | 7.37% |
| Yuma County | 227,510 | 5.5K | 41 | 10.65% |
| Coconino County | 144,078 | 18.6K | 7.7 | -0.76% |
| Cochise County | 127,465 | 6.2K | 21 | 1.54% |
| Navajo County | 110,329 | 9.9K | 11 | 3.35% |
| Apache County | 64,195 | 11.2K | 5.7 | -2.61% |
| Gila County | 53,476 | 4.8K | 11 | 0.26% |
| Santa Cruz County | 50,275 | 1.2K | 41 | 5.37% |
| Graham County | 40,075 | 4.6K | 8.7 | 3.75% |
| La Paz County | 16,752 | 4.5K | 3.7 | 1.15% |
| Greenlee County | 9,290 | 1.8K | 5.0 | -2.53% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)