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. The median across all 15 is +2,351. Biggest climber in the top 100 since 2020: Navajo County, AZ, up 5 places to #7.

Flip the list · Most population lost, US counties →

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Maricopa County, AZAZ4,689,558+268,990−72%

02▲1Pinal County, AZAZ539,380+114,116+80%

03▼1Pima County, AZAZ1,074,685+31,252−82%

04▲3Yuma County, AZAZ224,449+20,568−61%

05▼1Yavapai County, AZAZ252,552+16,343−73%

06▼1Mohave County, AZAZ228,102+14,835−76%

07▲5Navajo County, AZAZ109,946+3,229−84%

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

09▼1Graham County, AZAZ40,157+1,624−77%

10▲5Cochise County, AZAZ126,332+885−96%

11Gila County, AZAZ53,801+529−95%

12▲1La Paz County, AZAZ16,711+154−97%

13▼4Greenlee County, AZAZ9,312-251−147%

14▼8Coconino County, AZAZ144,368-733−104%

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

SHOWING 1–15 OF 15

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES