RANKING · 1990 CENSUS · 15 SHOWN OF 15

Most sparsely populated, Arizona counties · 1990

Arizona counties with the fewest 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 densely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01La Paz County, AZAZ16,7113−30%

02Greenlee County, AZAZ9,3124−6%

03Coconino County, AZAZ144,3685−17%

04Apache County, AZAZ64,4456−11%

05Graham County, AZAZ40,1576−21%

06Mohave County, AZAZ228,1027−40%

07Navajo County, AZAZ109,9468−20%

08Gila County, AZAZ53,8018−22%

09Yavapai County, AZAZ252,55213−36%

10Cochise County, AZAZ126,33216−17%

11Yuma County, AZAZ224,44919−33%

12Pinal County, AZAZ539,38022−35%

13Santa Cruz County, AZAZ50,02024−23%

14Pima County, AZAZ1,074,68573−21%

15Maricopa County, AZAZ4,689,558231−31%

SHOWING 1–15 OF 15

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