Census ACS · 15 counties
Largest Counties in Arizona
Arizona has 15 counties with Census data available. The largest is Maricopa County with a population of 4,491,987. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.
Source: Census ACS 5-Year Estimates
| # | County | Population | Median Income |
|---|---|---|---|
| 1 | Yuma County | 207,685 | $60,417 |
| 2 | Yavapai County | 241,656 | $66,106 |
| 3 | Santa Cruz County | 48,209 | $53,614 |
| 4 | Pinal County | 449,219 | $77,588 |
| 5 | Pima County | 1,049,947 | $67,929 |
| 6 | Navajo County | 107,744 | $52,752 |
| 7 | Mohave County | 217,420 | $55,799 |
| 8 | Maricopa County | 4,491,987 | $85,518 |
| 9 | La Paz County | 16,605 | $49,506 |
| 10 | Greenlee County | 9,452 | $75,239 |
| 11 | Graham County | 38,860 | $67,326 |
| 12 | Gila County | 53,610 | $59,089 |
| 13 | Coconino County | 144,643 | $69,748 |
| 14 | Cochise County | 125,458 | $58,970 |
| 15 | Apache County | 65,680 | $40,338 |
More Rankings for Arizona
Frequently Asked Questions
Maricopa County is the #1 ranked county in Arizona by population, with a value of 4,491,987 according to latest Census ACS data.
Arizona has 15 counties tracked in latest Census ACS data.
All data comes from the American Community Survey (ACS) 5-Year estimates by the US Census Bureau.
Data from the American Community Survey 5-Year estimates. Covers all counties in Arizona.
Source: U.S. Census Bureau ACS, 2026.