Data / Rankings / Population density / Counties in Arizona

Counties in Arizona by population density

Maricopa County had the highest population density of 15 counties in 2022, at 191.3 inhabitants per km². La Paz County had the lowest, at 1.4 inhabitants per km². The median was 6.4 inhabitants per km² and the figure for Arizona was 25 inhabitants per km². Source: the U.S. Census Bureau.

Highest191.3Maricopa County
Lowest1.4La Paz County
Median6.415 counties
Arizona25History

All counties, 2022

CSVChart (SVG)

Maricopa CountyMaricopa County: 191.3 inhabitants per km²191.3Pima CountyPima County: 44.5 inhabitants per km²44.5Pinal CountyPinal County: 33.5 inhabitants per km²33.5Santa Cruz CountySanta Cruz County: 15.2 inhabitants per km²15.2Yuma CountyYuma County: 14.6 inhabitants per km²14.6Yavapai CountyYavapai County: 11.7 inhabitants per km²11.7Cochise CountyCochise County: 7.8 inhabitants per km²7.8Mohave CountyMohave County: 6.4 inhabitants per km²6.4Gila CountyGila County: 4.4 inhabitants per km²4.4Navajo CountyNavajo County: 4.2 inhabitants per km²4.2Graham CountyGraham County: 3.2 inhabitants per km²3.2Coconino CountyCoconino County: 3 inhabitants per km²3Apache CountyApache County: 2.3 inhabitants per km²2.3Greenlee CountyGreenlee County: 2 inhabitants per km²2La Paz CountyLa Paz County: 1.4 inhabitants per km²1.4
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2022
inhabitants per km²		Change on 2021
1Maricopa County191.3+1.3%
2Pima County44.5+0.9%
3Pinal County33.5+3.7%
4Santa Cruz County15.2+1.3%
5Yuma County14.6+0.7%
6Yavapai County11.7+1.6%
7Cochise County7.8-0.6%
8Mohave County6.4+1.6%
9Gila County4.4+0.7%
10Navajo County4.2+0.9%
11Graham County3.2-0.3%
12Coconino County3+0.8%
13Apache County2.30%
14Greenlee County2-0.9%
15La Paz County1.4+0.6%

Other periods

About this ranking

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

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. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

Which county has the highest population density?

Maricopa County, with 191.3 inhabitants per km² in 2022, according to the U.S. Census Bureau.

Which county has the lowest population density?

La Paz County, with 1.4 inhabitants per km² 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, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved 2026-10-09.

Population density: other rankings

Counties in Arizona: more rankings