RANKING · 2025 ESTIMATES · 44 SHOWN OF 44

Fastest shrinking, Idaho counties

Idaho counties with the steepest population decline from the 2020 census to 2025. 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, IDID783-0.9%−103%

02Nez Perce County, IDID42,905+1.9%−82%

03Elmore County, IDID29,465+2.8%−93%

04Caribou County, IDID7,252+3.2%−35%

05Madison County, IDID55,172+4.3%−73%

06Clearwater County, IDID9,118+4.4%−12%

07Power County, IDID8,246+4.7%−27%

08Lewis County, IDID3,704+4.8%−26%

09Blaine County, IDID25,517+5.1%−87%

10Bannock County, IDID91,591+5.3%−64%

11Gooding County, IDID16,446+5.4%−75%

12Bear Lake County, IDID6,727+5.6%+4%

13Latah County, IDID41,842+5.9%−58%

14Minidoka County, IDID22,911+6.0%+43%

15Fremont County, IDID14,208+6.1%−24%

16Lemhi County, IDID8,474+6.3%−52%

17Owyhee County, IDID12,661+6.3%−77%

18Bingham County, IDID51,153+6.6%−40%

19Cassia County, IDID26,397+7.1%−27%

20Shoshone County, IDID14,130+7.3%−735%

21Idaho County, IDID17,874+8.1%−36%

22Butte County, IDID2,783+8.1%−1347%

23Twin Falls County, IDID97,539+8.3%−58%

24Custer County, IDID4,636+8.4%+67%

25Jerome County, IDID26,362+8.8%−59%

26Valley County, IDID12,831+9.2%−63%

27Lincoln County, IDID5,603+9.3%−58%

28Bonneville County, IDID135,771+9.5%−33%

29Payette County, IDID27,824+9.6%−62%

30Benewah County, IDID10,508+10.3%−34%

31Washington County, IDID11,583+10.3%−38%

32Ada County, IDID546,141+10.3%−78%

33Oneida County, IDID5,085+11.4%−37%

34Franklin County, IDID15,889+11.9%−47%

35Kootenai County, IDID191,864+12.0%−79%

36Boise County, IDID8,545+12.3%−86%

37Gem County, IDID21,773+13.9%−51%

38Teton County, IDID13,254+14.0%−81%

39Jefferson County, IDID35,297+14.3%−10%

40Adams County, IDID5,013+14.5%+112%

41Bonner County, IDID54,420+15.5%−60%

42Boundary County, IDID13,997+16.1%−13%

43Canyon County, IDID275,123+19.0%−59%

44Camas County, IDID1,316+22.2%−39%

SHOWING 1–44 OF 44

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES