Data / Rankings / Population / Counties in Arizona

Counties in Arizona by population

Maricopa County had the highest population of 15 counties in 2023, at 4.6 million. Greenlee County had the lowest, at 9,356. The median was 124,716 and the figure for Arizona was 7.45 million. Source: the U.S. Census Bureau.

Highest4,601,077Maricopa County
Lowest9,356Greenlee County
Median124,71615 counties
Arizona7,452,073History

All counties, 2023

CSVChart (SVG)

Maricopa CountyMaricopa County: 4,601,077 persons4,601,077Pima CountyPima County: 1,065,239 persons1,065,239Pinal CountyPinal County: 486,554 persons486,554Yavapai CountyYavapai County: 249,100 persons249,100Mohave CountyMohave County: 223,586 persons223,586Yuma CountyYuma County: 214,228 persons214,228Coconino CountyCoconino County: 144,554 persons144,554Cochise CountyCochise County: 124,716 persons124,716Navajo CountyNavajo County: 109,197 persons109,197Apache CountyApache County: 65,055 persons65,055Gila CountyGila County: 54,040 persons54,040Santa Cruz CountySanta Cruz County: 49,204 persons49,204Graham CountyGraham County: 39,552 persons39,552La Paz CountyLa Paz County: 16,615 persons16,615Greenlee CountyGreenlee County: 9,356 persons9,356
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2023
persons		Change on 2022
1Maricopa County4,601,077+0.9%
2Pima County1,065,239+0.7%
3Pinal County486,554+4.5%
4Yavapai County249,100+1.2%
5Mohave County223,586+1.3%
6Yuma County214,228+2.4%
7Coconino County144,554+0.3%
8Cochise County124,716-0.6%
9Navajo County109,197+0.5%
10Apache County65,055-0.5%
11Gila County54,040+0.3%
12Santa Cruz County49,204+1.2%
13Graham County39,552+2%
14La Paz County16,615+0.9%
15Greenlee County9,356+0.5%

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 4.6 million in 2023, according to the U.S. Census Bureau.

Which county has the lowest population?

Greenlee County, with 9,356 in 2023.

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