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. The median across all 44 is +8.3%. Biggest climber in the top 100 since 2020: Madison County, ID, up 39 places to #5.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Clark County, IDID783-0.9%−35.0 pts

02▲22Nez Perce County, IDID42,905+1.9%−8.9 pts

03▲17Elmore County, IDID29,465+2.8%−34.6 pts

04▲7Caribou County, IDID7,252+3.2%−1.7 pts

05▲39Madison County, IDID55,172+4.3%−11.8 pts

06▲1Clearwater County, IDID9,118+4.4%−0.6 pts

07▲2Power County, IDID8,246+4.7%−1.7 pts

08▼5Lewis County, IDID3,704+4.8%−1.7 pts

09▲24Blaine County, IDID25,517+5.1%−35.0 pts

10▲8Bannock County, IDID91,591+5.3%−9.2 pts

11▼1Gooding County, IDID16,446+5.4%−16.2 pts

12▲10Bear Lake County, IDID6,727+5.6%+0.2 pts

13▲8Latah County, IDID41,842+5.9%−8.2 pts

14▲12Minidoka County, IDID22,911+6.0%+1.8 pts

15▼3Fremont County, IDID14,208+6.1%−1.9 pts

16▼8Lemhi County, IDID8,474+6.3%−6.9 pts

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

18▲1Bingham County, IDID51,153+6.6%−4.5 pts

19▲6Cassia County, IDID26,397+7.1%−2.6 pts

20▼4Shoshone County, IDID14,130+7.3%+8.4 pts

21▼8Idaho County, IDID17,874+8.1%−4.5 pts

22▼20Butte County, IDID2,783+8.1%+8.8 pts

23▲14Twin Falls County, IDID97,539+8.3%−11.7 pts

24▼19Custer County, IDID4,636+8.4%+3.4 pts

25▲3Jerome County, IDID26,362+8.8%−12.4 pts

26▲14Valley County, IDID12,831+9.2%−16.0 pts

27▼21Lincoln County, IDID5,603+9.3%−13.0 pts

28▲11Bonneville County, IDID135,771+9.5%−4.8 pts

29▲3Payette County, IDID27,824+9.6%−15.6 pts

30▼16Benewah County, IDID10,508+10.3%−5.3 pts

31▼16Washington County, IDID11,583+10.3%−6.4 pts

32▲11Ada County, IDID546,141+10.3%−35.9 pts

33▼10Oneida County, IDID5,085+11.4%−6.7 pts

34▼3Franklin County, IDID15,889+11.9%−10.8 pts

35▲7Kootenai County, IDID191,864+12.0%−43.8 pts

36▼9Boise County, IDID8,545+12.3%−77.8 pts

37▼2Gem County, IDID21,773+13.9%−14.3 pts

38▼4Teton County, IDID13,254+14.0%−60.5 pts

39▼1Jefferson County, IDID35,297+14.3%−1.5 pts

40▼10Adams County, IDID5,013+14.5%+7.7 pts

41▼5Bonner County, IDID54,420+15.5%−22.8 pts

42▼13Boundary County, IDID13,997+16.1%−2.4 pts

43▼2Canyon County, IDID275,123+19.0%−26.9 pts

44▼40Camas County, IDID1,316+22.2%−14.1 pts

SHOWING 1–44 OF 44

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES