RANKING · 2025 ESTIMATES · 44 SHOWN OF 44

Fastest growing, Idaho counties

Idaho counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Camas County, IDID1,316+22.2%−39%

02Canyon County, IDID275,123+19.0%−59%

03Boundary County, IDID13,997+16.1%−13%

04Bonner County, IDID54,420+15.5%−60%

05Adams County, IDID5,013+14.5%+112%

06Jefferson County, IDID35,297+14.3%−10%

07Teton County, IDID13,254+14.0%−81%

08Gem County, IDID21,773+13.9%−51%

09Boise County, IDID8,545+12.3%−86%

10Kootenai County, IDID191,864+12.0%−79%

11Franklin County, IDID15,889+11.9%−47%

12Oneida County, IDID5,085+11.4%−37%

13Ada County, IDID546,141+10.3%−78%

14Washington County, IDID11,583+10.3%−38%

15Benewah County, IDID10,508+10.3%−34%

16Payette County, IDID27,824+9.6%−62%

17Bonneville County, IDID135,771+9.5%−33%

18Lincoln County, IDID5,603+9.3%−58%

19Valley County, IDID12,831+9.2%−63%

20Jerome County, IDID26,362+8.8%−59%

21Custer County, IDID4,636+8.4%+67%

22Twin Falls County, IDID97,539+8.3%−58%

23Butte County, IDID2,783+8.1%−1347%

24Idaho County, IDID17,874+8.1%−36%

25Shoshone County, IDID14,130+7.3%−735%

26Cassia County, IDID26,397+7.1%−27%

27Bingham County, IDID51,153+6.6%−40%

28Owyhee County, IDID12,661+6.3%−77%

29Lemhi County, IDID8,474+6.3%−52%

30Fremont County, IDID14,208+6.1%−24%

31Minidoka County, IDID22,911+6.0%+43%

32Latah County, IDID41,842+5.9%−58%

33Bear Lake County, IDID6,727+5.6%+4%

34Gooding County, IDID16,446+5.4%−75%

35Bannock County, IDID91,591+5.3%−64%

36Blaine County, IDID25,517+5.1%−87%

37Lewis County, IDID3,704+4.8%−26%

38Power County, IDID8,246+4.7%−27%

39Clearwater County, IDID9,118+4.4%−12%

40Madison County, IDID55,172+4.3%−73%

41Caribou County, IDID7,252+3.2%−35%

42Elmore County, IDID29,465+2.8%−93%

43Nez Perce County, IDID42,905+1.9%−82%

44Clark County, IDID783-0.9%−103%

SHOWING 1–44 OF 44

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