RANKING · 2025 ESTIMATES · 15 SHOWN OF 15

Fastest growing, Arizona counties

Arizona counties ranked by population growth from the 2020 census to 2025. This list covers the 15 counties in Arizona that qualify, ranked against each other statewide. The median across all 15 is +3.0%. Biggest climber in the top 100 since 2020: Yuma County, AZ, up 6 places to #2.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲2Pinal County, AZAZ539,380+26.8%−27.6 pts

02▲6Yuma County, AZAZ224,449+10.1%−39.6 pts

03▲3Mohave County, AZAZ228,102+7.0%−58.9 pts

04Yavapai County, AZAZ252,552+6.9%−48.6 pts

05▼4Maricopa County, AZAZ4,689,558+6.1%−38.7 pts

06▲4Santa Cruz County, AZAZ50,020+4.9%−24.4 pts

07▲2Graham County, AZAZ40,157+4.2%−21.9 pts

08▲4Navajo County, AZAZ109,946+3.0%−22.5 pts

09▼2Pima County, AZAZ1,074,685+3.0%−23.5 pts

10▲1Gila County, AZAZ53,801+1.0%−26.7 pts

11▲4La Paz County, AZAZ16,711+0.9%−41.5 pts

12▲1Cochise County, AZAZ126,332+0.7%−19.9 pts

13▼8Coconino County, AZAZ144,368-0.5%−20.9 pts

14Apache County, AZAZ64,445-2.4%−15.1 pts

15▼13Greenlee County, AZAZ9,312-2.6%−9.4 pts

SHOWING 1–15 OF 15

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES