Data / Rankings / Population / Counties in Arizona

Counties in Arizona by population, 2025

Maricopa County had the highest population of 15 counties in 2025, at 4.69 million. Greenlee County had the lowest, at 9,312. The median was 126,332 and the figure for Arizona was 7.62 million. Source: the U.S. Census Bureau.

Highest4,689,558Maricopa County
Lowest9,312Greenlee County
Median126,33215 counties
Arizona7,623,818History

All counties, 2025

CSVChart (SVG)

Maricopa CountyMaricopa County: 4,689,558 persons4,689,558Pima CountyPima County: 1,074,685 persons1,074,685Pinal CountyPinal County: 539,380 persons539,380Yavapai CountyYavapai County: 252,552 persons252,552Mohave CountyMohave County: 228,102 persons228,102Yuma CountyYuma County: 224,449 persons224,449Coconino CountyCoconino County: 144,368 persons144,368Cochise CountyCochise County: 126,332 persons126,332Navajo CountyNavajo County: 109,946 persons109,946Apache CountyApache County: 64,445 persons64,445Gila CountyGila County: 53,801 persons53,801Santa Cruz CountySanta Cruz County: 50,020 persons50,020Graham CountyGraham County: 40,157 persons40,157La Paz CountyLa Paz County: 16,711 persons16,711Greenlee CountyGreenlee County: 9,312 persons9,312
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2025
persons		Change on 2024
1Maricopa County4,689,558+0.8%
2Pima County1,074,685+0.1%
3Pinal County539,380+4.6%
4Yavapai County252,552+0.5%
5Mohave County228,102+0.8%
6Yuma County224,449+1.4%
7Coconino County144,368-0.2%
8Cochise County126,332+0.9%
9Navajo County109,946+0.3%
10Apache County64,445-0.4%
11Gila County53,801-0.6%
12Santa Cruz County50,020+0.5%
13Graham County40,157-0.2%
14La Paz County16,711+0.2%
15Greenlee County9,312-0.2%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

Which county has the highest population?

Maricopa County, with 4.69 million in 2025, according to the U.S. Census Bureau.

Which county has the lowest population?

Greenlee County, with 9,312 in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Arizona: more rankings