Data / Rankings / Population density / Counties in Idaho

Counties in Idaho by population density

Ada County had the highest population density of 44 counties in 2024, at 196.4 inhabitants per km². Clark County had the lowest, at 0.2 inhabitants per km². The median was 3.9 inhabitants per km² and the figure for Idaho was 9.3 inhabitants per km². Source: the U.S. Census Bureau.

Highest196.4Ada County
Lowest0.2Clark County
Median3.944 counties
Idaho9.3History

All counties, 2024

CSVChart (SVG)

Ada CountyAda County: 196.4 inhabitants per km²196.4Canyon CountyCanyon County: 175.9 inhabitants per km²175.9Kootenai CountyKootenai County: 58.8 inhabitants per km²58.8Madison CountyMadison County: 45.2 inhabitants per km²45.2Bannock CountyBannock County: 31.6 inhabitants per km²31.6Bonneville CountyBonneville County: 27.7 inhabitants per km²27.7Payette CountyPayette County: 26.3 inhabitants per km²26.3Nez Perce CountyNez Perce County: 19.5 inhabitants per km²19.5Twin Falls CountyTwin Falls County: 19.4 inhabitants per km²19.4Jerome CountyJerome County: 17 inhabitants per km²17Latah CountyLatah County: 14.9 inhabitants per km²14.9Gem CountyGem County: 14.8 inhabitants per km²14.8Jefferson CountyJefferson County: 12.3 inhabitants per km²12.3Bonner CountyBonner County: 12 inhabitants per km²12Minidoka CountyMinidoka County: 11.6 inhabitants per km²11.6Teton CountyTeton County: 11.3 inhabitants per km²11.3Bingham CountyBingham County: 9.4 inhabitants per km²9.4Franklin CountyFranklin County: 9.1 inhabitants per km²9.1Gooding CountyGooding County: 8.7 inhabitants per km²8.7Benewah CountyBenewah County: 5.2 inhabitants per km²5.2Boundary CountyBoundary County: 4.2 inhabitants per km²4.2Cassia CountyCassia County: 3.9 inhabitants per km²3.9Blaine CountyBlaine County: 3.8 inhabitants per km²3.8Elmore CountyElmore County: 3.7 inhabitants per km²3.7Washington CountyWashington County: 3.1 inhabitants per km²3.1Lewis CountyLewis County: 3 inhabitants per km²3Fremont CountyFremont County: 3 inhabitants per km²3Bear 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: 1.4 inhabitants per km²1.4Idaho 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

RankCounties2024
inhabitants per km²		Change on 2023
1Ada County196.4+1.7%
2Canyon County175.9+3.3%
3Kootenai County58.8+1.7%
4Madison County45.2+0.2%
5Bannock County31.6+0.5%
6Bonneville County27.7+1.7%
7Payette County26.3+1.5%
8Nez Perce County19.5-0.1%
9Twin Falls County19.4+1.1%
10Jerome County17+1.9%
11Latah County14.9+0.6%
12Gem County14.8+1.3%
13Jefferson County12.3+1.6%
14Bonner County12+2.1%
15Minidoka County11.6+0.5%
16Teton County11.3+3.2%
17Bingham County9.4+1.2%
18Franklin County9.1+0.8%
19Gooding County8.7+1.4%
20Benewah County5.2+0.9%
21Boundary County4.2+1.9%
22Cassia County3.9+1%
23Blaine County3.8+1.2%
24Elmore County3.7-0.1%
25Washington County3.1-0%
26Lewis County3-0.8%
27Fremont County3+0.8%
28Bear Lake County2.7-0.8%
29Power County2.3+0.5%
30Shoshone County2.1-0%
31Lincoln County1.8+2.4%
32Boise County1.7-0.3%
33Oneida County1.6+0.9%
34Caribou County1.6+0.2%
35Clearwater County1.4-0.4%
36Adams County1.4+2.3%
37Valley County1.4+1.3%
38Idaho County0.80%
39Lemhi County0.7-0.7%
40Owyhee County0.60%
41Butte County0.5-0.6%
42Camas County0.5+1.8%
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 196.4 inhabitants per km² in 2024, according to the U.S. Census Bureau.

Which county has the lowest population density?

Clark County, with 0.2 inhabitants per km² in 2024.

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