Data / Rankings / Population / Counties in Arizona

Counties in Arizona by population

Maricopa County had the highest population of 15 counties in 2022, at 4.56 million. Greenlee County had the lowest, at 9,311. The median was 125,418 and the figure for Arizona was 7.37 million. Source: the U.S. Census Bureau.

Highest4,559,561Maricopa County
Lowest9,311Greenlee County
Median125,41815 counties
Arizona7,370,065History

All counties, 2022

CSVChart (SVG)

Maricopa CountyMaricopa County: 4,559,561 persons4,559,561Pima CountyPima County: 1,058,224 persons1,058,224Pinal CountyPinal County: 465,550 persons465,550Yavapai CountyYavapai County: 246,237 persons246,237Mohave CountyMohave County: 220,791 persons220,791Yuma CountyYuma County: 209,117 persons209,117Coconino CountyCoconino County: 144,078 persons144,078Cochise CountyCochise County: 125,418 persons125,418Navajo CountyNavajo County: 108,671 persons108,671Apache CountyApache County: 65,361 persons65,361Gila CountyGila County: 53,902 persons53,902Santa Cruz CountySanta Cruz County: 48,600 persons48,600Graham CountyGraham County: 38,784 persons38,784La Paz CountyLa Paz County: 16,460 persons16,460Greenlee CountyGreenlee County: 9,311 persons9,311
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2022
persons		Change on 2021
1Maricopa County4,559,561+1.3%
2Pima County1,058,224+0.9%
3Pinal County465,550+3.7%
4Yavapai County246,237+1.6%
5Mohave County220,791+1.6%
6Yuma County209,117+0.7%
7Coconino County144,078+0.9%
8Cochise County125,418-0.6%
9Navajo County108,671+0.9%
10Apache County65,3610%
11Gila County53,902+0.7%
12Santa Cruz County48,600+1.3%
13Graham County38,784-0.3%
14La Paz County16,460+0.6%
15Greenlee County9,311-0.9%

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 4.56 million in 2022, according to the U.S. Census Bureau.

Which county has the lowest population?

Greenlee County, with 9,311 in 2022.

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