Data / Rankings / Population / Counties in Idaho

Counties in Idaho by population

Ada County had the highest population of 44 counties in 2024, at 535,225. Clark County had the lowest, at 782. The median was 15,004 and the figure for Idaho was 2 million. Source: the U.S. Census Bureau.

Highest535,225Ada County
Lowest782Clark County
Median15,00444 counties
Idaho2,000,872History

All counties, 2024

CSVChart (SVG)

Ada CountyAda County: 535,225 persons535,225Canyon CountyCanyon County: 267,444 persons267,444Kootenai CountyKootenai County: 188,398 persons188,398Bonneville CountyBonneville County: 133,793 persons133,793Twin Falls CountyTwin Falls County: 96,467 persons96,467Bannock CountyBannock County: 90,969 persons90,969Madison CountyMadison County: 54,948 persons54,948Bonner CountyBonner County: 53,650 persons53,650Bingham CountyBingham County: 50,966 persons50,966Nez Perce CountyNez Perce County: 42,894 persons42,894Latah CountyLatah County: 41,738 persons41,738Jefferson CountyJefferson County: 34,856 persons34,856Elmore CountyElmore County: 29,575 persons29,575Payette CountyPayette County: 27,679 persons27,679Jerome CountyJerome County: 26,288 persons26,288Cassia CountyCassia County: 26,210 persons26,210Blaine CountyBlaine County: 25,701 persons25,701Minidoka CountyMinidoka County: 22,727 persons22,727Gem CountyGem County: 21,450 persons21,450Idaho CountyIdaho County: 17,873 persons17,873Gooding CountyGooding County: 16,399 persons16,399Franklin CountyFranklin County: 15,662 persons15,662Fremont CountyFremont County: 14,346 persons14,346Shoshone CountyShoshone County: 14,026 persons14,026Boundary CountyBoundary County: 13,856 persons13,856Teton CountyTeton County: 13,105 persons13,105Valley CountyValley County: 12,817 persons12,817Owyhee CountyOwyhee County: 12,764 persons12,764Washington CountyWashington County: 11,492 persons11,492Benewah CountyBenewah County: 10,486 persons10,486Clearwater CountyClearwater County: 9,149 persons9,149Boise CountyBoise County: 8,506 persons8,506Lemhi CountyLemhi County: 8,408 persons8,408Power CountyPower County: 8,333 persons8,333Caribou CountyCaribou County: 7,222 persons7,222Bear Lake CountyBear Lake County: 6,703 persons6,703Lincoln CountyLincoln County: 5,631 persons5,631Oneida CountyOneida County: 5,016 persons5,016Adams CountyAdams County: 5,010 persons5,010Custer CountyCuster County: 4,582 persons4,582Lewis CountyLewis County: 3,713 persons3,713Butte CountyButte County: 2,726 persons2,726Camas CountyCamas County: 1,287 persons1,287Clark CountyClark County: 782 persons782
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2024
persons		Change on 2023
1Ada County535,225+1.7%
2Canyon County267,444+3.3%
3Kootenai County188,398+1.7%
4Bonneville County133,793+1.7%
5Twin Falls County96,467+1.1%
6Bannock County90,969+0.5%
7Madison County54,948+0.2%
8Bonner County53,650+2.1%
9Bingham County50,966+1.2%
10Nez Perce County42,894-0.1%
11Latah County41,738+0.6%
12Jefferson County34,856+1.6%
13Elmore County29,575-0.1%
14Payette County27,679+1.5%
15Jerome County26,288+1.9%
16Cassia County26,210+1%
17Blaine County25,701+1.2%
18Minidoka County22,727+0.5%
19Gem County21,450+1.3%
20Idaho County17,873-0%
21Gooding County16,399+1.4%
22Franklin County15,662+0.8%
23Fremont County14,346+0.8%
24Shoshone County14,026-0%
25Boundary County13,856+1.9%
26Teton County13,105+3.2%
27Valley County12,817+1.3%
28Owyhee County12,764-0%
29Washington County11,492-0%
30Benewah County10,486+0.9%
31Clearwater County9,149-0.4%
32Boise County8,506-0.4%
33Lemhi County8,408-0.6%
34Power County8,333+0.5%
35Caribou County7,222+0.1%
36Bear Lake County6,703-0.8%
37Lincoln County5,631+2.3%
38Oneida County5,016+1%
39Adams County5,010+2.3%
40Custer County4,582+1.1%
41Lewis County3,713-0.8%
42Butte County2,726-0.7%
43Camas County1,287+1.7%
44Clark County782-2%

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.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Idaho by population using official data, and cite the source.
rank_places {"indicator":"population","level":"province","within":"Idaho","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population&level=province&within=Idaho&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population?

Ada County, with 535,225 in 2024, according to the U.S. Census Bureau.

Which county has the lowest population?

Clark County, with 782 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, 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