RANKING · 2020 CENSUS · 44 SHOWN OF 44

Fastest shrinking, Idaho counties · 2020

Idaho counties with the steepest population decline from the 2010 census to 2020. 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 population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Clark County, IDID783-19.6%−53.7 pts

02Butte County, IDID2,783-11.0%−10.3 pts

03Lewis County, IDID3,704-7.5%−14.1 pts

04Camas County, IDID1,316-3.6%−39.9 pts

05Custer County, IDID4,636-2.1%−7.2 pts

06Lincoln County, IDID5,603-1.6%−23.8 pts

07Clearwater County, IDID9,118-0.3%−5.3 pts

08Lemhi County, IDID8,474+0.5%−12.7 pts

09Power County, IDID8,246+0.8%−5.6 pts

10Gooding County, IDID16,446+0.9%−20.8 pts

11Caribou County, IDID7,252+0.9%−4.0 pts

12Fremont County, IDID14,208+1.1%−7.0 pts

13Idaho County, IDID17,874+1.7%−10.9 pts

14Benewah County, IDID10,508+2.6%−12.9 pts

15Washington County, IDID11,583+3.0%−13.7 pts

16Shoshone County, IDID14,130+3.2%+4.3 pts

17Owyhee County, IDID12,661+3.4%−23.5 pts

18Bannock County, IDID91,591+5.0%−9.4 pts

19Bingham County, IDID51,153+5.2%−5.8 pts

20Elmore County, IDID29,465+6.0%−31.4 pts

21Latah County, IDID41,842+6.1%−8.0 pts

22Bear Lake County, IDID6,727+6.4%+1.1 pts

23Oneida County, IDID5,085+6.5%−11.6 pts

24Nez Perce County, IDID42,905+7.2%−3.6 pts

25Cassia County, IDID26,397+7.4%−2.2 pts

26Minidoka County, IDID22,911+7.7%+3.5 pts

27Boise County, IDID8,545+8.3%−81.8 pts

28Jerome County, IDID26,362+8.3%−12.8 pts

29Boundary County, IDID13,997+9.9%−8.6 pts

30Adams County, IDID5,013+10.1%+3.3 pts

31Franklin County, IDID15,889+11.0%−11.7 pts

32Payette County, IDID27,824+12.2%−13.0 pts

33Blaine County, IDID25,517+13.5%−26.6 pts

34Teton County, IDID13,254+14.4%−60.1 pts

35Gem County, IDID21,773+14.4%−13.8 pts

36Bonner County, IDID54,420+15.2%−23.1 pts

37Twin Falls County, IDID97,539+16.6%−3.4 pts

38Jefferson County, IDID35,297+18.2%+2.4 pts

39Bonneville County, IDID135,771+18.9%+4.6 pts

40Valley County, IDID12,831+19.1%−6.1 pts

41Canyon County, IDID275,123+22.3%−23.6 pts

42Kootenai County, IDID191,864+23.7%−32.0 pts

43Ada County, IDID546,141+26.1%−20.1 pts

44Madison County, IDID55,172+41.0%+24.9 pts

SHOWING 1–44 OF 44

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS