Counties · Arizona
Counties of Arizona
Arizona has 15 counties. Maricopa County is the largest with 4,689,558 residents in 2025. 12 of the 15 gained residents between 2020 and 2025 by the Census Bureau's estimates.
What counties are in Arizona?
Sorted by the 2025 population estimate; sort by any column.
| Maricopa County | 4,689,558 | +6.0% | $89,300 |
|---|---|---|---|
| Pima County | 1,074,685 | +3.0% | $70,315 |
| Pinal County | 539,380 | +26.6% | $80,266 |
| Yavapai County | 252,552 | +6.9% | $69,613 |
| Mohave County | 228,102 | +7.0% | $57,684 |
| Yuma County | 224,449 | +9.5% | $62,876 |
| Coconino County | 144,368 | −0.5% | $72,966 |
| Cochise County | 126,332 | +0.7% | $59,742 |
| Navajo County | 109,946 | +3.0% | $54,606 |
| Apache County | 64,445 | −2.4% | $41,438 |
| Gila County | 53,801 | +1.0% | $61,986 |
| Santa Cruz County | 50,020 | +4.9% | $55,217 |
| Graham County | 40,157 | +4.2% | $67,325 |
| La Paz County | 16,711 | +0.9% | $49,478 |
| Greenlee County | 9,312 | −2.6% | $71,164 |
Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections