RANKING · 1990 CENSUS · 15 SHOWN OF 15

Most densely populated, Arizona counties · 1990

Arizona counties ranked by residents per square mile (2023). This list covers the 15 counties in Arizona that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Maricopa County, AZAZ4,689,558231−31%

02Pima County, AZAZ1,074,68573−21%

03Santa Cruz County, AZAZ50,02024−23%

04Pinal County, AZAZ539,38022−35%

05Yuma County, AZAZ224,44919−33%

06Cochise County, AZAZ126,33216−17%

07Yavapai County, AZAZ252,55213−36%

08Gila County, AZAZ53,8018−22%

09Navajo County, AZAZ109,9468−20%

10Mohave County, AZAZ228,1027−40%

11Graham County, AZAZ40,1576−21%

12Apache County, AZAZ64,4456−11%

13Coconino County, AZAZ144,3685−17%

14Greenlee County, AZAZ9,3124−6%

15La Paz County, AZAZ16,7113−30%

SHOWING 1–15 OF 15

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES