Data / Rankings / Population density / Counties in Idaho

Counties in Idaho by population density

Ada County had the highest population density of 44 counties in 2022, at 190.9 inhabitants per km². Clark County had the lowest, at 0.2 inhabitants per km². The median was 3.8 inhabitants per km² and the figure for Idaho was 9.1 inhabitants per km². Source: the U.S. Census Bureau.

Highest190.9Ada County
Lowest0.2Clark County
Median3.844 counties
Idaho9.1History

All counties, 2022

CSVChart (SVG)

Ada CountyAda County: 190.9 inhabitants per km²190.9Canyon CountyCanyon County: 165.3 inhabitants per km²165.3Kootenai CountyKootenai County: 57.2 inhabitants per km²57.2Madison CountyMadison County: 45.5 inhabitants per km²45.5Bannock CountyBannock County: 31.2 inhabitants per km²31.2Bonneville CountyBonneville County: 26.8 inhabitants per km²26.8Payette CountyPayette County: 25.6 inhabitants per km²25.6Nez Perce CountyNez Perce County: 19.6 inhabitants per km²19.6Twin Falls CountyTwin Falls County: 18.9 inhabitants per km²18.9Jerome CountyJerome County: 16.3 inhabitants per km²16.3Latah CountyLatah County: 14.7 inhabitants per km²14.7Gem CountyGem County: 14.2 inhabitants per km²14.2Jefferson CountyJefferson County: 11.8 inhabitants per km²11.8Bonner CountyBonner County: 11.5 inhabitants per km²11.5Minidoka CountyMinidoka County: 11.3 inhabitants per km²11.3Teton CountyTeton County: 10.8 inhabitants per km²10.8Bingham CountyBingham County: 9.2 inhabitants per km²9.2Franklin CountyFranklin County: 8.8 inhabitants per km²8.8Gooding CountyGooding County: 8.4 inhabitants per km²8.4Benewah CountyBenewah County: 5.1 inhabitants per km²5.1Boundary CountyBoundary County: 4.1 inhabitants per km²4.1Cassia CountyCassia County: 3.9 inhabitants per km²3.9Elmore CountyElmore County: 3.7 inhabitants per km²3.7Blaine CountyBlaine County: 3.7 inhabitants per km²3.7Lewis CountyLewis County: 3 inhabitants per km²3Washington CountyWashington County: 3 inhabitants per km²3Fremont CountyFremont County: 2.9 inhabitants per km²2.9Bear Lake CountyBear Lake County: 2.7 inhabitants per km²2.7Power CountyPower County: 2.2 inhabitants per km²2.2Shoshone CountyShoshone County: 2 inhabitants per km²2Lincoln CountyLincoln County: 1.7 inhabitants per km²1.7Boise CountyBoise County: 1.7 inhabitants per km²1.7Caribou CountyCaribou County: 1.6 inhabitants per km²1.6Oneida CountyOneida County: 1.5 inhabitants per km²1.5Clearwater CountyClearwater County: 1.4 inhabitants per km²1.4Adams CountyAdams County: 1.4 inhabitants per km²1.4Valley CountyValley County: 1.3 inhabitants per km²1.3Idaho CountyIdaho County: 0.8 inhabitants per km²0.8Lemhi CountyLemhi County: 0.7 inhabitants per km²0.7Owyhee CountyOwyhee County: 0.6 inhabitants per km²0.6Butte CountyButte County: 0.5 inhabitants per km²0.5Camas CountyCamas County: 0.4 inhabitants per km²0.4Custer CountyCuster County: 0.4 inhabitants per km²0.4Clark CountyClark County: 0.2 inhabitants per km²0.2
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
1Ada County190.9+1.4%
2Canyon County165.3+3.2%
3Kootenai County57.2+1.9%
4Madison County45.5+2.1%
5Bannock County31.2+1.4%
6Bonneville County26.8+1.2%
7Payette County25.6+2.1%
8Nez Perce County19.6+1.1%
9Twin Falls County18.9+1.6%
10Jerome County16.3+2.1%
11Latah County14.7+2%
12Gem County14.2+4.2%
13Jefferson County11.8+3.6%
14Bonner County11.5+3.6%
15Minidoka County11.3+1.2%
16Teton County10.8+2.2%
17Bingham County9.2+2.2%
18Franklin County8.8+3.4%
19Gooding County8.4+0.6%
20Benewah County5.1+4%
21Boundary County4.1+5.6%
22Cassia County3.9+1.7%
23Elmore County3.7+1.5%
24Blaine County3.7+1.7%
25Lewis County3+1%
26Washington County3+2.6%
27Fremont County2.9+3.3%
28Bear Lake County2.7+2.7%
29Power County2.2+1.9%
30Shoshone County2+2.4%
31Lincoln County1.7+1.7%
32Boise County1.7+3.3%
33Caribou County1.6+1.2%
34Oneida County1.5+2.9%
35Clearwater County1.4+1.1%
36Adams County1.4+3.4%
37Valley County1.3+1.5%
38Idaho County0.8+3.5%
39Lemhi County0.7+1.6%
40Owyhee County0.6+2.4%
41Butte County0.5+0.9%
42Camas County0.4+2.5%
43Custer County0.4+1.1%
44Clark County0.2+2.3%

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?

Ada County, with 190.9 inhabitants per km² in 2022, according to the U.S. Census Bureau.

Which county has the lowest population density?

Clark County, with 0.2 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 Idaho: more rankings