Data / Rankings / Population density / Counties in Idaho

Counties in Idaho by population density

Ada County had the highest population density of 44 counties in 2023, at 193.1 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 9.2 inhabitants per km². Source: the U.S. Census Bureau.

Highest193.1Ada County
Lowest0.2Clark County
Median3.844 counties
Idaho9.2History

All counties, 2023

CSVChart (SVG)

Ada CountyAda County: 193.1 inhabitants per km²193.1Canyon CountyCanyon County: 170.2 inhabitants per km²170.2Kootenai CountyKootenai County: 57.8 inhabitants per km²57.8Madison CountyMadison County: 45.1 inhabitants per km²45.1Bannock CountyBannock County: 31.4 inhabitants per km²31.4Bonneville CountyBonneville County: 27.2 inhabitants per km²27.2Payette CountyPayette County: 25.9 inhabitants per km²25.9Nez Perce CountyNez Perce County: 19.6 inhabitants per km²19.6Twin Falls CountyTwin Falls County: 19.2 inhabitants per km²19.2Jerome CountyJerome County: 16.7 inhabitants per km²16.7Latah CountyLatah County: 14.8 inhabitants per km²14.8Gem CountyGem County: 14.6 inhabitants per km²14.6Jefferson CountyJefferson County: 12.1 inhabitants per km²12.1Bonner CountyBonner County: 11.7 inhabitants per km²11.7Minidoka CountyMinidoka County: 11.5 inhabitants per km²11.5Teton CountyTeton County: 10.9 inhabitants per km²10.9Bingham CountyBingham County: 9.3 inhabitants per km²9.3Franklin CountyFranklin County: 9 inhabitants per km²9Gooding CountyGooding County: 8.6 inhabitants per km²8.6Benewah CountyBenewah County: 5.2 inhabitants per km²5.2Boundary 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 km²3.7Washington CountyWashington County: 3.1 inhabitants per km²3.1Lewis CountyLewis 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: 2.3 inhabitants per km²2.3Shoshone CountyShoshone County: 2.1 inhabitants per km²2.1Lincoln CountyLincoln County: 1.8 inhabitants per km²1.8Boise CountyBoise County: 1.7 inhabitants per km²1.7Oneida CountyOneida County: 1.6 inhabitants per km²1.6Caribou CountyCaribou County: 1.6 inhabitants per km²1.6Clearwater 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: 0.5 inhabitants per km²0.5Custer 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

RankCounties2023
inhabitants per km²		Change on 2022
1Ada County193.1+1.2%
2Canyon County170.2+3%
3Kootenai County57.8+0.9%
4Madison County45.1-0.8%
5Bannock County31.4+0.8%
6Bonneville County27.2+1.4%
7Payette County25.9+1.3%
8Nez Perce County19.6-0.1%
9Twin Falls County19.2+1.6%
10Jerome County16.7+2.1%
11Latah County14.8+0.6%
12Gem County14.6+2.7%
13Jefferson County12.1+2.8%
14Bonner County11.7+2.2%
15Minidoka County11.5+1.8%
16Teton County10.9+1.2%
17Bingham County9.3+0.8%
18Franklin County9+2.3%
19Gooding County8.6+1.7%
20Benewah County5.2+1%
21Boundary County4.1+2%
22Cassia County3.9+1.1%
23Elmore County3.7+0.6%
24Blaine County3.7+0.8%
25Washington County3.1+2.8%
26Lewis County30%
27Fremont County2.9+1.4%
28Bear Lake County2.7+0.2%
29Power County2.3+2%
30Shoshone County2.1+0.8%
31Lincoln County1.8+2.3%
32Boise County1.7+1.4%
33Oneida County1.6+4.8%
34Caribou County1.6+0.1%
35Clearwater County1.4+1.8%
36Adams County1.4+2.4%
37Valley County1.3+1.8%
38Idaho County0.8+1.2%
39Lemhi County0.7+2.1%
40Owyhee County0.6+0.9%
41Butte County0.5+2.2%
42Camas County0.5+8.9%
43Custer County0.4+0.6%
44Clark County0.2-1.7%

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 193.1 inhabitants per km² in 2023, according to the U.S. Census Bureau.

Which county has the lowest population density?

Clark County, with 0.2 inhabitants per km² in 2023.

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