Data / Rankings / Population / Counties in Idaho

Counties in Idaho by population

Ada County had the highest population of 44 counties in 2022, at 520,365. Clark County had the lowest, at 811. The median was 14,608 and the figure for Idaho was 1.94 million. Source: the U.S. Census Bureau.

Highest520,365Ada County
Lowest811Clark County
Median14,60844 counties
Idaho1,942,951History

All counties, 2022

CSVChart (SVG)

Ada CountyAda County: 520,365 persons520,365Canyon CountyCanyon County: 251,397 persons251,397Kootenai CountyKootenai County: 183,512 persons183,512Bonneville CountyBonneville County: 129,654 persons129,654Twin Falls CountyTwin Falls County: 93,890 persons93,890Bannock CountyBannock County: 89,855 persons89,855Madison CountyMadison County: 55,251 persons55,251Bonner CountyBonner County: 51,437 persons51,437Bingham CountyBingham County: 49,979 persons49,979Nez Perce CountyNez Perce County: 42,998 persons42,998Latah CountyLatah County: 41,211 persons41,211Jefferson CountyJefferson County: 33,358 persons33,358Elmore CountyElmore County: 29,425 persons29,425Payette CountyPayette County: 26,925 persons26,925Cassia CountyCassia County: 25,657 persons25,657Jerome CountyJerome County: 25,268 persons25,268Blaine CountyBlaine County: 25,200 persons25,200Minidoka CountyMinidoka County: 22,214 persons22,214Gem CountyGem County: 20,627 persons20,627Idaho CountyIdaho County: 17,654 persons17,654Gooding CountyGooding County: 15,900 persons15,900Franklin CountyFranklin County: 15,179 persons15,179Fremont CountyFremont County: 14,036 persons14,036Shoshone CountyShoshone County: 13,924 persons13,924Boundary CountyBoundary County: 13,324 persons13,324Owyhee CountyOwyhee County: 12,642 persons12,642Teton CountyTeton County: 12,551 persons12,551Valley CountyValley County: 12,432 persons12,432Washington CountyWashington County: 11,178 persons11,178Benewah CountyBenewah County: 10,293 persons10,293Clearwater CountyClearwater County: 9,032 persons9,032Boise CountyBoise County: 8,419 persons8,419Lemhi CountyLemhi County: 8,285 persons8,285Power CountyPower County: 8,130 persons8,130Caribou CountyCaribou County: 7,201 persons7,201Bear Lake CountyBear Lake County: 6,742 persons6,742Lincoln CountyLincoln County: 5,380 persons5,380Adams CountyAdams County: 4,778 persons4,778Oneida CountyOneida County: 4,740 persons4,740Custer CountyCuster County: 4,503 persons4,503Lewis CountyLewis County: 3,741 persons3,741Butte CountyButte County: 2,690 persons2,690Camas CountyCamas County: 1,163 persons1,163Clark CountyClark County: 811 persons811
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2022
persons		Change on 2021
1Ada County520,365+1.4%
2Canyon County251,397+3.2%
3Kootenai County183,512+1.9%
4Bonneville County129,654+1.2%
5Twin Falls County93,890+1.6%
6Bannock County89,855+1.4%
7Madison County55,251+2.1%
8Bonner County51,437+3.6%
9Bingham County49,979+2.1%
10Nez Perce County42,998+1.1%
11Latah County41,211+2%
12Jefferson County33,358+3.6%
13Elmore County29,425+1.5%
14Payette County26,925+2.1%
15Cassia County25,657+1.7%
16Jerome County25,268+2.1%
17Blaine County25,200+1.7%
18Minidoka County22,214+1.2%
19Gem County20,627+4.2%
20Idaho County17,654+3.5%
21Gooding County15,900+0.6%
22Franklin County15,179+3.4%
23Fremont County14,036+3.3%
24Shoshone County13,924+2.4%
25Boundary County13,324+5.6%
26Owyhee County12,642+2.3%
27Teton County12,551+2.2%
28Valley County12,432+1.5%
29Washington County11,178+2.5%
30Benewah County10,293+4%
31Clearwater County9,032+1.1%
32Boise County8,419+3.4%
33Lemhi County8,285+1.5%
34Power County8,130+1.9%
35Caribou County7,201+1.2%
36Bear Lake County6,742+2.7%
37Lincoln County5,380+1.7%
38Adams County4,778+3.4%
39Oneida County4,740+3%
40Custer County4,503+1.3%
41Lewis County3,741+1%
42Butte County2,690+1%
43Camas County1,163+2.5%
44Clark County811+2.1%

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 520,365 in 2022, according to the U.S. Census Bureau.

Which county has the lowest population?

Clark County, with 811 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, 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