RANKING · 2020 CENSUS · 44 SHOWN OF 44

Fastest shrinking, Idaho counties

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

01Clark County, IDID783-19.6%−157%

02Butte County, IDID2,783-11.0%+1584%

03Lewis County, IDID3,704-7.5%−215%

04Camas County, IDID1,316-3.6%−110%

05Custer County, IDID4,636-2.1%−142%

06Lincoln County, IDID5,603-1.6%−107%

07Clearwater County, IDID9,118-0.3%−106%

08Lemhi County, IDID8,474+0.5%−96%

09Power County, IDID8,246+0.8%−88%

10Gooding County, IDID16,446+0.9%−96%

11Caribou County, IDID7,252+0.9%−81%

12Fremont County, IDID14,208+1.1%−86%

13Idaho County, IDID17,874+1.7%−87%

14Benewah County, IDID10,508+2.6%−83%

15Washington County, IDID11,583+3.0%−82%

16Shoshone County, IDID14,130+3.2%−376%

17Owyhee County, IDID12,661+3.4%−87%

18Bannock County, IDID91,591+5.0%−65%

19Bingham County, IDID51,153+5.2%−53%

20Elmore County, IDID29,465+6.0%−84%

21Latah County, IDID41,842+6.1%−57%

22Bear Lake County, IDID6,727+6.4%+20%

23Oneida County, IDID5,085+6.5%−64%

24Nez Perce County, IDID42,905+7.2%−34%

25Cassia County, IDID26,397+7.4%−23%

26Minidoka County, IDID22,911+7.7%+83%

27Boise County, IDID8,545+8.3%−91%

28Jerome County, IDID26,362+8.3%−61%

29Boundary County, IDID13,997+9.9%−47%

30Adams County, IDID5,013+10.1%+49%

31Franklin County, IDID15,889+11.0%−52%

32Payette County, IDID27,824+12.2%−52%

33Blaine County, IDID25,517+13.5%−66%

34Teton County, IDID13,254+14.4%−81%

35Gem County, IDID21,773+14.4%−49%

36Bonner County, IDID54,420+15.2%−60%

37Twin Falls County, IDID97,539+16.6%−17%

38Jefferson County, IDID35,297+18.2%+15%

39Bonneville County, IDID135,771+18.9%+33%

40Valley County, IDID12,831+19.1%−24%

41Canyon County, IDID275,123+22.3%−51%

42Kootenai County, IDID191,864+23.7%−57%

43Ada County, IDID546,141+26.1%−43%

44Madison County, IDID55,172+41.0%+156%

SHOWING 1–44 OF 44

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