RANKING · 2020 CENSUS · 44 SHOWN OF 44

Most population lost, Idaho counties · 2020

Idaho counties that lost the most residents from the 2010 census to 2020, 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

01Butte County, IDID2,783-317+1568%

02Lewis County, IDID3,704-288−225%

03Clark County, IDID783-192−174%

04Custer County, IDID4,636-93−144%

05Lincoln County, IDID5,603-81−111%

06Camas County, IDID1,316-40−115%

07Clearwater County, IDID9,118-27−106%

08Lemhi County, IDID8,474+38−96%

09Power County, IDID8,246+61−87%

10Caribou County, IDID7,252+64−81%

11Gooding County, IDID16,446+134−95%

12Fremont County, IDID14,208+146−83%

13Benewah County, IDID10,508+245−80%

14Idaho County, IDID17,874+274−84%

15Oneida County, IDID5,085+278−56%

16Washington County, IDID11,583+302−79%

17Bear Lake County, IDID6,727+386+18%

18Owyhee County, IDID12,661+387−83%

19Adams County, IDID5,013+403+82%

20Shoshone County, IDID14,130+404−353%

21Boise County, IDID8,545+582−82%

22Boundary County, IDID13,997+1,084−30%

23Franklin County, IDID15,889+1,408−33%

24Teton County, IDID13,254+1,460−43%

25Minidoka County, IDID22,911+1,544+90%

26Elmore County, IDID29,465+1,628−79%

27Cassia County, IDID26,397+1,703−10%

28Jerome County, IDID26,362+1,863−42%

29Valley County, IDID12,831+1,884+22%

30Latah County, IDID41,842+2,273−47%

31Bingham County, IDID51,153+2,385−43%

32Gem County, IDID21,773+2,404−28%

33Payette County, IDID27,824+2,763−33%

34Nez Perce County, IDID42,905+2,825−23%

35Blaine County, IDID25,517+2,896−47%

36Bannock County, IDID91,591+4,179−56%

37Jefferson County, IDID35,297+4,751+82%

38Bonner County, IDID54,420+6,233−39%

39Twin Falls County, IDID97,539+12,816+20%

40Madison County, IDID55,172+15,377+305%

41Bonneville County, IDID135,771+19,730+91%

42Kootenai County, IDID191,864+32,868−15%

43Canyon County, IDID275,123+42,182+2%

44Ada County, IDID546,141+102,602+8%

SHOWING 1–44 OF 44

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS