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
4,788,038
1,103,289
568,796
257,041
231,835
15 Counties
| County | 2026 Pop. ↓ | Area (mi²) | Density | Change (2020) |
|---|---|---|---|---|
| Maricopa County | 4,788,038 | 9.2K | 520 | 7.71% |
| Pima County | 1,103,289 | 9.2K | 120 | 5.55% |
| Pinal County | 568,796 | 5.4K | 106 | 32.21% |
| Yavapai County | 257,041 | 8.1K | 32 | 8.35% |
| Mohave County | 231,835 | 13.3K | 17 | 8.25% |
| Yuma County | 230,034 | 5.5K | 42 | 11.85% |
| Coconino County | 145,615 | 18.6K | 8 | 0.29% |
| Cochise County | 127,557 | 6.2K | 21 | 1.61% |
| Navajo County | 109,986 | 9.9K | 11 | 3.01% |
| Apache County | 64,158 | 11.2K | 6 | -2.67% |
| Gila County | 54,099 | 4.8K | 11 | 1.39% |
| Santa Cruz County | 52,230 | 1.2K | 42 | 9.47% |
| Graham County | 41,604 | 4.6K | 9 | 7.7% |
| La Paz County | 17,352 | 4.5K | 4 | 4.7% |
| Greenlee County | 9,464 | 1.8K | 5 | -0.7% |
Overview of Arizona Counties
There are 15 counties in Arizona.
Maricopa County is the largest county in the state, with a population of 4,788,038. The most recent census shows that its population has increased by 0.08% since the previous census.
A number of other Arizona counties also boast relatively large populations for their state, though not able to match the density of Maricopa County:
- Pima County : 1,103,289
- Pinal County : 568,796
Arizona Counties with the Fewest Residents
The smallest county in Arizona is Greenlee County , with a population of just 9,464. This total represents a decrease of 0.0% since the last census count was performed.
Other small counties include:
- La Paz County : 17,352
- Graham County : 41,604
- Santa Cruz County : 52,230
Arizona Counties with Rapid Growth
Pinal County , with its sizeable population of 568,796, has shown the largest population growth, with an increase of 0.3% since the last census.
On the other hand, Apache County has had the largest decrease in population, with its 64,158 current residents totalling 0.0% less than the previous census.
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)