Data / Rankings / Population density / Counties in Arizona

Counties in Arizona by population density

Maricopa County had the highest population density of 15 counties in 2021, at 188.8 inhabitants per km². La Paz County had the lowest, at 1.4 inhabitants per km². The median was 6.3 inhabitants per km² and the figure for Arizona was 24.7 inhabitants per km². Source: the U.S. Census Bureau.

Highest188.8Maricopa County
Lowest1.4La Paz County
Median6.315 counties
Arizona24.7History

All counties, 2021

CSVChart (SVG)

Maricopa CountyMaricopa County: 188.8 inhabitants per km²188.8Pima CountyPima County: 44.1 inhabitants per km²44.1Pinal CountyPinal County: 32.3 inhabitants per km²32.3Santa Cruz CountySanta Cruz County: 15 inhabitants per km²15Yuma CountyYuma County: 14.5 inhabitants per km²14.5Yavapai CountyYavapai County: 11.5 inhabitants per km²11.5Cochise CountyCochise County: 7.8 inhabitants per km²7.8Mohave CountyMohave County: 6.3 inhabitants per km²6.3Gila CountyGila County: 4.3 inhabitants per km²4.3Navajo CountyNavajo County: 4.2 inhabitants per km²4.2Graham CountyGraham County: 3.3 inhabitants per km²3.3Coconino 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

RankCounties2021
inhabitants per km²		Change on 2020
1Maricopa County188.8+1.2%
2Pima County44.1+0.4%
3Pinal County32.3+4.4%
4Santa Cruz County15+0.5%
5Yuma County14.5+1%
6Yavapai County11.5+2.2%
7Cochise County7.8+0.5%
8Mohave County6.3+1.4%
9Gila County4.3+0.3%
10Navajo County4.2+0.9%
11Graham County3.3+0.7%
12Coconino County3-1.6%
13Apache County2.3-0.9%
14Greenlee County2-1.4%
15La Paz County1.4-1.2%

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 188.8 inhabitants per km² in 2021, according to the U.S. Census Bureau.

Which county has the lowest population density?

La Paz County, with 1.4 inhabitants per km² in 2021.

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