RANKING · 2025 ESTIMATES · 44 SHOWN OF 44

Most population lost, Idaho counties

Idaho counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide. The median across all 44 is +1,085. Biggest climber in the top 100 since 2020: Nez Perce County, ID, up 18 places to #16.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲2Clark County, IDID783-7−103%

02Lewis County, IDID3,704+171−26%

03▼2Butte County, IDID2,783+209−1200%

04▲6Caribou County, IDID7,252+225−34%

05▲1Camas County, IDID1,316+239−9%

06▲11Bear Lake County, IDID6,727+355+9%

07▼3Custer County, IDID4,636+361+73%

08▲1Power County, IDID8,246+368−19%

09▼2Clearwater County, IDID9,118+384−10%

10▼5Lincoln County, IDID5,603+476−35%

11▼3Lemhi County, IDID8,474+500−45%

12▲3Oneida County, IDID5,085+521−18%

13▲6Adams County, IDID5,013+634+186%

14▲4Owyhee County, IDID12,661+748−67%

15▲11Elmore County, IDID29,465+799−90%

16▲18Nez Perce County, IDID42,905+815−78%

17▼5Fremont County, IDID14,208+820−7%

18▼7Gooding County, IDID16,446+848−66%

19▲2Boise County, IDID8,545+935−70%

20Shoshone County, IDID14,130+961−701%

21▼8Benewah County, IDID10,508+978−21%

22▼6Washington County, IDID11,583+1,083−24%

23▲6Valley County, IDID12,831+1,085−30%

24▲11Blaine County, IDID25,517+1,245−77%

25Minidoka County, IDID22,911+1,298+60%

26▼12Idaho County, IDID17,874+1,333−23%

27▼3Teton County, IDID13,254+1,624−37%

28▼5Franklin County, IDID15,889+1,695−19%

29▼2Cassia County, IDID26,397+1,742−8%

30▼8Boundary County, IDID13,997+1,941+26%

31▼3Jerome County, IDID26,362+2,125−34%

32▲8Madison County, IDID55,172+2,259−40%

33▼3Latah County, IDID41,842+2,325−46%

34▼1Payette County, IDID27,824+2,438−41%

35▼3Gem County, IDID21,773+2,650−21%

36▼5Bingham County, IDID51,153+3,161−24%

37Jefferson County, IDID35,297+4,406+69%

38▼2Bannock County, IDID91,591+4,573−52%

39▼1Bonner County, IDID54,420+7,310−28%

40▼1Twin Falls County, IDID97,539+7,493−30%

41Bonneville County, IDID135,771+11,807+14%

42Kootenai County, IDID191,864+20,502−47%

43Canyon County, IDID275,123+44,018+6%

44Ada County, IDID546,141+51,174−46%

SHOWING 1–44 OF 44

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