RANKING · 2010 CENSUS · 44 SHOWN OF 44

Fastest shrinking, Idaho counties · 2010

Idaho counties with the steepest population decline since the prior decennial census. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Shoshone County, IDID14,130-7.3%+536%

02Elmore County, IDID29,465-7.2%−119%

03Bear Lake County, IDID6,727-6.6%−223%

04Caribou County, IDID7,252-4.7%−195%

05Clark County, IDID783-3.9%−111%

06Clearwater County, IDID9,118-1.9%−138%

07Minidoka County, IDID22,911-0.5%−112%

08Butte County, IDID2,783-0.3%−58%

09Custer County, IDID4,636+0.6%−88%

10Benewah County, IDID10,508+1.2%−92%

11Lemhi County, IDID8,474+1.7%−87%

12Lewis County, IDID3,704+2.0%−70%

13Washington County, IDID11,583+2.2%−87%

14Power County, IDID8,246+3.7%−42%

15Oneida County, IDID5,085+3.9%−78%

16Idaho County, IDID17,874+4.9%−61%

17Nez Perce County, IDID42,905+5.0%−54%

18Boise County, IDID8,545+5.4%−94%

19Latah County, IDID41,842+6.6%−53%

20Cassia County, IDID26,397+7.2%−26%

21Owyhee County, IDID12,661+8.3%−69%

22Gooding County, IDID16,446+9.2%−57%

23Bingham County, IDID51,153+9.3%−16%

24Bannock County, IDID91,591+9.6%−33%

25Payette County, IDID27,824+9.9%−61%

26Gem County, IDID21,773+10.1%−64%

27Bonner County, IDID54,420+11.0%−71%

28Boundary County, IDID13,997+11.2%−40%

29Fremont County, IDID14,208+12.0%+49%

30Blaine County, IDID25,517+12.6%−69%

31Camas County, IDID1,316+12.7%−65%

32Franklin County, IDID15,889+12.9%−43%

33Adams County, IDID5,013+14.4%+111%

34Twin Falls County, IDID97,539+20.1%+1%

35Jerome County, IDID26,362+22.0%+4%

36Bonneville County, IDID135,771+26.3%+84%

37Kootenai County, IDID191,864+27.4%−51%

38Lincoln County, IDID5,603+28.8%+29%

39Valley County, IDID12,831+28.9%+14%

40Ada County, IDID546,141+30.4%−34%

41Jefferson County, IDID35,297+36.5%+131%

42Madison County, IDID55,172+36.7%+129%

43Canyon County, IDID275,123+43.7%−5%

44Teton County, IDID13,254+69.5%−7%

SHOWING 1–44 OF 44

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES