Data / Rankings / Population density / Counties in Utah

Counties in Utah by population density

Salt Lake County had the highest population density of 29 counties in 2021, at 608.7 inhabitants per km². Garfield County had the lowest, at 0.4 inhabitants per km². The median was 4 inhabitants per km² and the figure for Utah was 15.6 inhabitants per km². Source: the U.S. Census Bureau.

Highest608.7Salt Lake County
Lowest0.4Garfield County
Median429 counties
Utah15.6History

All counties, 2021

CSVChart (SVG)

Salt Lake CountySalt Lake County: 608.7 inhabitants per km²608.7Davis CountyDavis County: 436.8 inhabitants per km²436.8Weber CountyWeber County: 168.5 inhabitants per km²168.5Utah CountyUtah County: 132.1 inhabitants per km²132.1Cache CountyCache County: 45.6 inhabitants per km²45.6Washington CountyWashington County: 30.5 inhabitants per km²30.5Wasatch CountyWasatch County: 11.9 inhabitants per km²11.9Summit CountySummit County: 8.9 inhabitants per km²8.9Morgan CountyMorgan County: 8 inhabitants per km²8Iron CountyIron County: 7.1 inhabitants per km²7.1Sanpete CountySanpete County: 7.1 inhabitants per km²7.1Carbon CountyCarbon County: 5.3 inhabitants per km²5.3Sevier CountySevier County: 4.4 inhabitants per km²4.4Tooele CountyTooele County: 4.2 inhabitants per km²4.2Box Elder CountyBox Elder County: 4 inhabitants per km²4Uintah CountyUintah County: 3.1 inhabitants per km²3.1Duchesne CountyDuchesne County: 2.4 inhabitants per km²2.4Juab CountyJuab County: 1.4 inhabitants per km²1.4Beaver CountyBeaver County: 1.1 inhabitants per km²1.1Grand CountyGrand County: 1 inhabitants per km²1Rich CountyRich County: 1 inhabitants per km²1Emery CountyEmery County: 0.9 inhabitants per km²0.9Kane CountyKane County: 0.8 inhabitants per km²0.8Piute CountyPiute County: 0.8 inhabitants per km²0.8Millard CountyMillard County: 0.8 inhabitants per km²0.8San Juan CountySan Juan County: 0.7 inhabitants per km²0.7Daggett CountyDaggett County: 0.5 inhabitants per km²0.5Wayne CountyWayne County: 0.4 inhabitants per km²0.4Garfield CountyGarfield County: 0.4 inhabitants per km²0.4
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
1Salt Lake County608.7-0%
2Davis County436.8+1.1%
3Weber County168.5+1.4%
4Utah County132.1+3.4%
5Cache County45.6+2.9%
6Washington County30.5+5.2%
7Wasatch County11.9+3.4%
8Summit County8.9+1.7%
9Morgan County8+2.3%
10Iron County7.1+4.9%
11Sanpete County7.1+2%
12Carbon County5.3-0.6%
13Sevier County4.4+1.6%
14Tooele County4.2+4.7%
15Box Elder County4+3%
16Uintah County3.1+1.6%
17Duchesne County2.4+0.9%
18Juab County1.4+3.3%
19Beaver County1.1+1.7%
20Grand County10%
21Rich County1+3.8%
22Emery County0.9+1.2%
23Kane County0.8+3.9%
24Piute County0.8+3.8%
25Millard County0.8+1.1%
26San Juan County0.7-0.3%
27Daggett County0.5+3.4%
28Wayne County0.4+2.3%
29Garfield County0.4+0.3%

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?

Salt Lake County, with 608.7 inhabitants per km² in 2021, according to the U.S. Census Bureau.

Which county has the lowest population density?

Garfield County, with 0.4 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 Utah: more rankings