RANKING · 2000 CENSUS · 44 SHOWN OF 44

Most densely populated, Idaho counties · 2000

Idaho counties ranked by residents per square mile (2000). This list covers the 44 counties in Idaho that qualify, ranked against each other statewide. The median across all 44 is 8.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population gained Most population lost Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 1990

01Ada County, IDID546,141286+46%

02Canyon County, IDID275,123224+46%

03Kootenai County, IDID191,86488+56%

04Bannock County, IDID91,59168+14%

05Madison County, IDID55,17259+16%

06Payette County, IDID27,82451+25%

07Bonneville County, IDID135,77144+14%

08Nez Perce County, IDID42,90544+11%

09Twin Falls County, IDID97,53933+20%

10Latah County, IDID41,84232+14%

11Jerome County, IDID26,36231+21%

12Gem County, IDID21,77327+28%

13Minidoka County, IDID22,91127+4%

14Bonner County, IDID54,42021+38%

15Bingham County, IDID51,15320+11%

16Gooding County, IDID16,44619+22%

17Jefferson County, IDID35,29718+16%

18Franklin County, IDID15,88917+23%

19Teton County, IDID13,25413+74%

20Benewah County, IDID10,50812+16%

21Elmore County, IDID29,4659+37%

22Cassia County, IDID26,3978+10%

23Lewis County, IDID3,7048+7%

24Boundary County, IDID13,9978+18%

25Blaine County, IDID25,5177+40%

26Washington County, IDID11,5837+17%

27Bear Lake County, IDID6,7277+5%

28Fremont County, IDID14,2086+8%

29Power County, IDID8,2465+6%

30Shoshone County, IDID14,1305−1%

31Caribou County, IDID7,2524+5%

32Clearwater County, IDID9,1184+5%

33Boise County, IDID8,5454+90%

34Oneida County, IDID5,0853+18%

35Lincoln County, IDID5,6033+22%

36Adams County, IDID5,0133+7%

37Valley County, IDID12,8312+25%

38Idaho County, IDID17,8742+13%

39Lemhi County, IDID8,4742+13%

40Owyhee County, IDID12,6611+27%

41Butte County, IDID2,7831−1%

42Camas County, IDID1,3161+36%

43Custer County, IDID4,6361+5%

44Clark County, IDID7831+34%

SHOWING 1–44 OF 44

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS