RANKING · 2020 CENSUS · 15 SHOWN OF 15

Most population gained, Arizona counties · 2020

Arizona counties that added the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 15 counties in Arizona that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Maricopa County, AZAZ4,689,558+603,451−36%

02Pima County, AZAZ1,074,685+63,170−64%

03Pinal County, AZAZ539,380+49,494−22%

04Yavapai County, AZAZ252,552+25,176−58%

05Mohave County, AZAZ228,102+13,081−79%

06Coconino County, AZAZ144,368+10,680−46%

07Yuma County, AZAZ224,449+8,130−85%

08Graham County, AZAZ40,157+1,313−81%

09Greenlee County, AZAZ9,312+1,126+109%

10Santa Cruz County, AZAZ50,020+249−97%

11Gila County, AZAZ53,801-325−103%

12Navajo County, AZAZ109,946-732−104%

13La Paz County, AZAZ16,711-3,932−167%

14Apache County, AZAZ64,445-5,497−170%

15Cochise County, AZAZ126,332-5,899−129%

SHOWING 1–15 OF 15

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS