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.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Clark County, IDID783-7−103%

02Lewis County, IDID3,704+171−26%

03Butte County, IDID2,783+209−1200%

04Caribou County, IDID7,252+225−34%

05Camas County, IDID1,316+239−9%

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

07Custer County, IDID4,636+361+73%

08Power County, IDID8,246+368−19%

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

10Lincoln County, IDID5,603+476−35%

11Lemhi County, IDID8,474+500−45%

12Oneida County, IDID5,085+521−18%

13Adams County, IDID5,013+634+186%

14Owyhee County, IDID12,661+748−67%

15Elmore County, IDID29,465+799−90%

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

17Fremont County, IDID14,208+820−7%

18Gooding County, IDID16,446+848−66%

19Boise County, IDID8,545+935−70%

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

21Benewah County, IDID10,508+978−21%

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

23Valley County, IDID12,831+1,085−30%

24Blaine County, IDID25,517+1,245−77%

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

26Idaho County, IDID17,874+1,333−23%

27Teton County, IDID13,254+1,624−37%

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

29Cassia County, IDID26,397+1,742−8%

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

31Jerome County, IDID26,362+2,125−34%

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

33Latah County, IDID41,842+2,325−46%

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

35Gem County, IDID21,773+2,650−21%

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

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

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

39Bonner County, IDID54,420+7,310−28%

40Twin 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 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES