RANKING · 2000 CENSUS · 44 SHOWN OF 44

Largest by population, Idaho counties · 2000

The most populous Idaho counties as of the 2000 population estimates. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide.

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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 1990

01Ada County, IDID300,904+46%

02Canyon County, IDID131,441+46%

03Kootenai County, IDID108,685+56%

04Bonneville County, IDID82,522+14%

05Bannock County, IDID75,565+14%

06Twin Falls County, IDID64,284+20%

07Bingham County, IDID41,735+11%

08Nez Perce County, IDID37,410+11%

09Bonner County, IDID36,835+38%

10Latah County, IDID34,935+14%

11Elmore County, IDID29,130+37%

12Madison County, IDID27,467+16%

13Cassia County, IDID21,416+10%

14Payette County, IDID20,578+25%

15Minidoka County, IDID20,174+4%

16Jefferson County, IDID19,155+16%

17Blaine County, IDID18,991+40%

18Jerome County, IDID18,342+21%

19Idaho County, IDID15,511+13%

20Gem County, IDID15,181+28%

21Gooding County, IDID14,155+22%

22Shoshone County, IDID13,771−1%

23Fremont County, IDID11,819+8%

24Franklin County, IDID11,329+23%

25Owyhee County, IDID10,644+27%

26Washington County, IDID9,977+17%

27Boundary County, IDID9,871+18%

28Benewah County, IDID9,171+16%

29Clearwater County, IDID8,930+5%

30Lemhi County, IDID7,806+13%

31Valley County, IDID7,651+25%

32Power County, IDID7,538+6%

33Caribou County, IDID7,304+5%

34Boise County, IDID6,670+90%

35Bear Lake County, IDID6,411+5%

36Teton County, IDID5,999+74%

37Custer County, IDID4,342+5%

38Oneida County, IDID4,125+18%

39Lincoln County, IDID4,044+22%

40Lewis County, IDID3,747+7%

41Adams County, IDID3,476+7%

42Butte County, IDID2,899−1%

43Clark County, IDID1,022+34%

44Camas County, IDID991+36%

SHOWING 1–44 OF 44

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