RANKING · 2010 CENSUS · 44 SHOWN OF 44

Largest by population, Idaho counties · 2010

The most populous Idaho counties as of the 2010 population estimates. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide.

IdahoAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Ada County, IDID392,365+30%

02Canyon County, IDID188,923+44%

03Kootenai County, IDID138,494+27%

04Bonneville County, IDID104,234+26%

05Bannock County, IDID82,839+10%

06Twin Falls County, IDID77,230+20%

07Bingham County, IDID45,607+9%

08Bonner County, IDID40,877+11%

09Nez Perce County, IDID39,265+5%

10Madison County, IDID37,536+37%

11Latah County, IDID37,244+7%

12Elmore County, IDID27,038−7%

13Jefferson County, IDID26,140+36%

14Cassia County, IDID22,952+7%

15Payette County, IDID22,623+10%

16Jerome County, IDID22,374+22%

17Blaine County, IDID21,376+13%

18Minidoka County, IDID20,069−1%

19Gem County, IDID16,719+10%

20Idaho County, IDID16,267+5%

21Gooding County, IDID15,464+9%

22Fremont County, IDID13,242+12%

23Franklin County, IDID12,786+13%

24Shoshone County, IDID12,765−7%

25Owyhee County, IDID11,526+8%

26Boundary County, IDID10,972+11%

27Washington County, IDID10,198+2%

28Teton County, IDID10,170+70%

29Valley County, IDID9,862+29%

30Benewah County, IDID9,285+1%

31Clearwater County, IDID8,761−2%

32Lemhi County, IDID7,936+2%

33Power County, IDID7,817+4%

34Boise County, IDID7,028+5%

35Caribou County, IDID6,963−5%

36Bear Lake County, IDID5,986−7%

37Lincoln County, IDID5,208+29%

38Custer County, IDID4,368+1%

39Oneida County, IDID4,286+4%

40Adams County, IDID3,976+14%

41Lewis County, IDID3,821+2%

42Butte County, IDID2,891−0%

43Camas County, IDID1,117+13%

44Clark County, IDID982−4%

SHOWING 1–44 OF 44

Download CSV (full list, 44 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS