Data / Rankings / Population / Counties in Arizona

Counties in Arizona by population

Maricopa County had the highest population of 15 counties in 2024, at 4.65 million. Greenlee County had the lowest, at 9,334. The median was 125,199 and the figure for Arizona was 7.56 million. Source: the U.S. Census Bureau.

Highest4,654,147Maricopa County
Lowest9,334Greenlee County
Median125,19915 counties
Arizona7,556,424History

All counties, 2024

CSVChart (SVG)

Maricopa CountyMaricopa County: 4,654,147 persons4,654,147Pima CountyPima County: 1,073,456 persons1,073,456Pinal CountyPinal County: 515,726 persons515,726Yavapai CountyYavapai County: 251,196 persons251,196Mohave CountyMohave County: 226,262 persons226,262Yuma CountyYuma County: 221,388 persons221,388Coconino CountyCoconino County: 144,658 persons144,658Cochise CountyCochise County: 125,199 persons125,199Navajo CountyNavajo County: 109,563 persons109,563Apache CountyApache County: 64,695 persons64,695Gila CountyGila County: 54,126 persons54,126Santa Cruz CountySanta Cruz County: 49,765 persons49,765Graham CountyGraham County: 40,239 persons40,239La Paz CountyLa Paz County: 16,670 persons16,670Greenlee CountyGreenlee County: 9,334 persons9,334
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2024
persons		Change on 2023
1Maricopa County4,654,147+1.2%
2Pima County1,073,456+0.8%
3Pinal County515,726+6%
4Yavapai County251,196+0.8%
5Mohave County226,262+1.2%
6Yuma County221,388+3.3%
7Coconino County144,658+0.1%
8Cochise County125,199+0.4%
9Navajo County109,563+0.3%
10Apache County64,695-0.6%
11Gila County54,126+0.2%
12Santa Cruz County49,765+1.1%
13Graham County40,239+1.7%
14La Paz County16,670+0.3%
15Greenlee County9,334-0.2%

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.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Arizona by population using official data, and cite the source.
rank_places {"indicator":"population","level":"province","within":"Arizona","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population&level=province&within=Arizona&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population?

Maricopa County, with 4.65 million in 2024, according to the U.S. Census Bureau.

Which county has the lowest population?

Greenlee County, with 9,334 in 2024.

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