RANKING · 1990 CENSUS · 44 SHOWN OF 44

Most sparsely populated, Idaho counties · 1990

Idaho counties with the fewest residents per square mile (1990). This list covers the 44 counties in Idaho that qualify, ranked against each other statewide. The median across all 44 is 7.

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SAME RANKING BYCities States Metros

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

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Clark County, IDID7830–

02Camas County, IDID1,3161–

03Custer County, IDID4,6361–

04Owyhee County, IDID12,6611–

05Butte County, IDID2,7831–

06Lemhi County, IDID8,4742–

07Idaho County, IDID17,8742–

08Valley County, IDID12,8312–

09Boise County, IDID8,5452–

10Adams County, IDID5,0132–

11Lincoln County, IDID5,6033–

12Oneida County, IDID5,0853–

13Clearwater County, IDID9,1183–

14Caribou County, IDID7,2524–

15Power County, IDID8,2465–

16Blaine County, IDID25,5175–

17Shoshone County, IDID14,1305–

18Fremont County, IDID14,2086–

19Washington County, IDID11,5836–

20Bear Lake County, IDID6,7276–

21Boundary County, IDID13,9977–

22Elmore County, IDID29,4657–

23Lewis County, IDID3,7047–

24Cassia County, IDID26,3978–

25Teton County, IDID13,2548–

26Benewah County, IDID10,50810–

27Franklin County, IDID15,88914–

28Jefferson County, IDID35,29715–

29Bonner County, IDID54,42015–

30Gooding County, IDID16,44616–

31Bingham County, IDID51,15318–

32Gem County, IDID21,77321–

33Jerome County, IDID26,36225–

34Minidoka County, IDID22,91126–

35Twin Falls County, IDID97,53928–

36Latah County, IDID41,84228–

37Bonneville County, IDID135,77139–

38Nez Perce County, IDID42,90540–

39Payette County, IDID27,82440–

40Madison County, IDID55,17250–

41Kootenai County, IDID191,86456–

42Bannock County, IDID91,59159–

43Canyon County, IDID275,123153–

44Ada County, IDID546,141196–

SHOWING 1–44 OF 44

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