RANKING · 2025 ESTIMATES · 15 SHOWN OF 15

Most population gained, Arizona counties

Arizona counties that added the most residents from the 2020 census to 2025, 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+268,990−72%

02Pinal County, AZAZ539,380+114,116+80%

03Pima County, AZAZ1,074,685+31,252−82%

04Yuma County, AZAZ224,449+20,568−61%

05Yavapai County, AZAZ252,552+16,343−73%

06Mohave County, AZAZ228,102+14,835−76%

07Navajo County, AZAZ109,946+3,229−84%

08Santa Cruz County, AZAZ50,020+2,351−73%

09Graham County, AZAZ40,157+1,624−77%

10Cochise County, AZAZ126,332+885−96%

11Gila County, AZAZ53,801+529−95%

12La Paz County, AZAZ16,711+154−97%

13Greenlee County, AZAZ9,312-251−147%

14Coconino County, AZAZ144,368-733−104%

15Apache County, AZAZ64,445-1,576−120%

SHOWING 1–15 OF 15

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES