RANKING · 2025 ESTIMATES · 15 SHOWN OF 15

Most densely populated, Arizona counties

Arizona counties ranked by residents per square mile (2025). This list covers the 15 counties in Arizona that qualify, ranked against each other statewide. The median across all 15 is 17.

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SAME RANKING BYCities States Metros

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

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Maricopa County, AZAZ4,689,558510+53%

02Pima County, AZAZ1,074,685117+27%

03Pinal County, AZAZ539,380101+200%

04▲1Yuma County, AZAZ224,44941+40%

05▼1Santa Cruz County, AZAZ50,02040+30%

06Yavapai County, AZAZ252,55231+51%

07Cochise County, AZAZ126,33220+7%

08Mohave County, AZAZ228,10217+47%

09Gila County, AZAZ53,80111+5%

10Navajo County, AZAZ109,94611+13%

11Graham County, AZAZ40,1579+20%

12Coconino County, AZAZ144,3688+24%

13Apache County, AZAZ64,4456−7%

14Greenlee County, AZAZ9,3125+9%

15La Paz County, AZAZ16,7114−15%

SHOWING 1–15 OF 15

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