Data / Rankings / Population / Counties in Idaho

Counties in Idaho by population

Ada County had the highest population of 44 counties in 2023, at 526,352. Clark County had the lowest, at 798. The median was 14,883 and the figure for Idaho was 1.97 million. Source: the U.S. Census Bureau.

Highest526,352Ada County
Lowest798Clark County
Median14,88344 counties
Idaho1,970,497History

All counties, 2023

CSVChart (SVG)

Ada CountyAda County: 526,352 persons526,352Canyon CountyCanyon County: 258,839 persons258,839Kootenai CountyKootenai County: 185,218 persons185,218Bonneville CountyBonneville County: 131,513 persons131,513Twin Falls CountyTwin Falls County: 95,392 persons95,392Bannock CountyBannock County: 90,538 persons90,538Madison CountyMadison County: 54,819 persons54,819Bonner CountyBonner County: 52,542 persons52,542Bingham CountyBingham County: 50,386 persons50,386Nez Perce CountyNez Perce County: 42,954 persons42,954Latah CountyLatah County: 41,476 persons41,476Jefferson CountyJefferson County: 34,296 persons34,296Elmore CountyElmore County: 29,615 persons29,615Payette CountyPayette County: 27,271 persons27,271Cassia CountyCassia County: 25,948 persons25,948Jerome CountyJerome County: 25,798 persons25,798Blaine CountyBlaine County: 25,392 persons25,392Minidoka CountyMinidoka County: 22,621 persons22,621Gem CountyGem County: 21,180 persons21,180Idaho CountyIdaho County: 17,881 persons17,881Gooding CountyGooding County: 16,175 persons16,175Franklin CountyFranklin County: 15,533 persons15,533Fremont CountyFremont County: 14,233 persons14,233Shoshone CountyShoshone County: 14,029 persons14,029Boundary CountyBoundary County: 13,596 persons13,596Owyhee CountyOwyhee County: 12,765 persons12,765Teton CountyTeton County: 12,699 persons12,699Valley CountyValley County: 12,658 persons12,658Washington CountyWashington County: 11,497 persons11,497Benewah CountyBenewah County: 10,391 persons10,391Clearwater CountyClearwater County: 9,189 persons9,189Boise CountyBoise County: 8,536 persons8,536Lemhi CountyLemhi County: 8,458 persons8,458Power CountyPower County: 8,292 persons8,292Caribou CountyCaribou County: 7,212 persons7,212Bear Lake CountyBear Lake County: 6,755 persons6,755Lincoln CountyLincoln County: 5,502 persons5,502Oneida CountyOneida County: 4,968 persons4,968Adams CountyAdams County: 4,895 persons4,895Custer CountyCuster County: 4,531 persons4,531Lewis CountyLewis County: 3,743 persons3,743Butte CountyButte County: 2,745 persons2,745Camas CountyCamas County: 1,266 persons1,266Clark CountyClark County: 798 persons798
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2023
persons		Change on 2022
1Ada County526,352+1.2%
2Canyon County258,839+3%
3Kootenai County185,218+0.9%
4Bonneville County131,513+1.4%
5Twin Falls County95,392+1.6%
6Bannock County90,538+0.8%
7Madison County54,819-0.8%
8Bonner County52,542+2.1%
9Bingham County50,386+0.8%
10Nez Perce County42,954-0.1%
11Latah County41,476+0.6%
12Jefferson County34,296+2.8%
13Elmore County29,615+0.6%
14Payette County27,271+1.3%
15Cassia County25,948+1.1%
16Jerome County25,798+2.1%
17Blaine County25,392+0.8%
18Minidoka County22,621+1.8%
19Gem County21,180+2.7%
20Idaho County17,881+1.3%
21Gooding County16,175+1.7%
22Franklin County15,533+2.3%
23Fremont County14,233+1.4%
24Shoshone County14,029+0.8%
25Boundary County13,596+2%
26Owyhee County12,765+1%
27Teton County12,699+1.2%
28Valley County12,658+1.8%
29Washington County11,497+2.9%
30Benewah County10,391+1%
31Clearwater County9,189+1.7%
32Boise County8,536+1.4%
33Lemhi County8,458+2.1%
34Power County8,292+2%
35Caribou County7,212+0.2%
36Bear Lake County6,755+0.2%
37Lincoln County5,502+2.3%
38Oneida County4,968+4.8%
39Adams County4,895+2.4%
40Custer County4,531+0.6%
41Lewis County3,743+0.1%
42Butte County2,745+2%
43Camas County1,266+8.9%
44Clark County798-1.6%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

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. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

Which county has the highest population?

Ada County, with 526,352 in 2023, according to the U.S. Census Bureau.

Which county has the lowest population?

Clark County, with 798 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, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.

Population: other rankings

Counties in Idaho: more rankings