RANKING · 2000 CENSUS · 15 SHOWN OF 15

Most densely populated, Arizona counties · 2000

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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YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Maricopa County, AZAZ4,689,558334+0%

02Pima County, AZAZ1,074,68592+0%

03Pinal County, AZAZ539,38033+0%

04Santa Cruz County, AZAZ50,02031+0%

05Yuma County, AZAZ224,44929+0%

06Yavapai County, AZAZ252,55221+0%

07Cochise County, AZAZ126,33219+0%

08Mohave County, AZAZ228,10212+0%

09Gila County, AZAZ53,80111+0%

10Navajo County, AZAZ109,94610+0%

11Graham County, AZAZ40,1577+0%

12Coconino County, AZAZ144,3686+0%

13Apache County, AZAZ64,4456+0%

14Greenlee County, AZAZ9,3125+0%

15La Paz County, AZAZ16,7114+0%

SHOWING 1–15 OF 15

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