RANKING · 2025 ESTIMATES · 15 SHOWN OF 15

Largest by population, Arizona counties

The most populous Arizona counties as of the 2025 population estimates. This list covers the 15 counties in Arizona that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Maricopa County, AZAZ4,689,558+53%

02Pima County, AZAZ1,074,685+27%

03Pinal County, AZAZ539,380+200%

04Yavapai County, AZAZ252,552+51%

05Mohave County, AZAZ228,102+47%

06Yuma County, AZAZ224,449+40%

07Coconino County, AZAZ144,368+24%

08Cochise County, AZAZ126,332+7%

09Navajo County, AZAZ109,946+13%

10Apache County, AZAZ64,445−7%

11Gila County, AZAZ53,801+5%

12Santa Cruz County, AZAZ50,020+30%

13Graham County, AZAZ40,157+20%

14La Paz County, AZAZ16,711−15%

15Greenlee County, AZAZ9,312+9%

SHOWING 1–15 OF 15

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES