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%−35.0 pts

02Nez Perce County, IDID42,905+1.9%−8.9 pts

03Elmore County, IDID29,465+2.8%−34.6 pts

04Caribou County, IDID7,252+3.2%−1.7 pts

05Madison County, IDID55,172+4.3%−11.8 pts

06Clearwater County, IDID9,118+4.4%−0.6 pts

07Power County, IDID8,246+4.7%−1.7 pts

08Lewis County, IDID3,704+4.8%−1.7 pts

09Blaine County, IDID25,517+5.1%−35.0 pts

10Bannock County, IDID91,591+5.3%−9.2 pts

11Gooding County, IDID16,446+5.4%−16.2 pts

12Bear Lake County, IDID6,727+5.6%+0.2 pts

13Latah County, IDID41,842+5.9%−8.2 pts

14Minidoka County, IDID22,911+6.0%+1.8 pts

15Fremont County, IDID14,208+6.1%−1.9 pts

16Lemhi County, IDID8,474+6.3%−6.9 pts

17Owyhee County, IDID12,661+6.3%−20.6 pts

18Bingham County, IDID51,153+6.6%−4.5 pts

19Cassia County, IDID26,397+7.1%−2.6 pts

20Shoshone County, IDID14,130+7.3%+8.4 pts

21Idaho County, IDID17,874+8.1%−4.5 pts

22Butte County, IDID2,783+8.1%+8.8 pts

23Twin Falls County, IDID97,539+8.3%−11.7 pts

24Custer County, IDID4,636+8.4%+3.4 pts

25Jerome County, IDID26,362+8.8%−12.4 pts

26Valley County, IDID12,831+9.2%−16.0 pts

27Lincoln County, IDID5,603+9.3%−13.0 pts

28Bonneville County, IDID135,771+9.5%−4.8 pts

29Payette County, IDID27,824+9.6%−15.6 pts

30Benewah County, IDID10,508+10.3%−5.3 pts

31Washington County, IDID11,583+10.3%−6.4 pts

32Ada County, IDID546,141+10.3%−35.9 pts

33Oneida County, IDID5,085+11.4%−6.7 pts

34Franklin County, IDID15,889+11.9%−10.8 pts

35Kootenai County, IDID191,864+12.0%−43.8 pts

36Boise County, IDID8,545+12.3%−77.8 pts

37Gem County, IDID21,773+13.9%−14.3 pts

38Teton County, IDID13,254+14.0%−60.5 pts

39Jefferson County, IDID35,297+14.3%−1.5 pts

40Adams County, IDID5,013+14.5%+7.7 pts

41Bonner County, IDID54,420+15.5%−22.8 pts

42Boundary County, IDID13,997+16.1%−2.4 pts

43Canyon County, IDID275,123+19.0%−26.9 pts

44Camas County, IDID1,316+22.2%−14.1 pts

SHOWING 1–44 OF 44

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES