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%−14.1 pts

02Canyon County, IDID275,123+19.0%−26.9 pts

03Boundary County, IDID13,997+16.1%−2.4 pts

04Bonner County, IDID54,420+15.5%−22.8 pts

05Adams County, IDID5,013+14.5%+7.7 pts

06Jefferson County, IDID35,297+14.3%−1.5 pts

07Teton County, IDID13,254+14.0%−60.5 pts

08Gem County, IDID21,773+13.9%−14.3 pts

09Boise County, IDID8,545+12.3%−77.8 pts

10Kootenai County, IDID191,864+12.0%−43.8 pts

11Franklin County, IDID15,889+11.9%−10.8 pts

12Oneida County, IDID5,085+11.4%−6.7 pts

13Ada County, IDID546,141+10.3%−35.9 pts

14Washington County, IDID11,583+10.3%−6.4 pts

15Benewah County, IDID10,508+10.3%−5.3 pts

16Payette County, IDID27,824+9.6%−15.6 pts

17Bonneville County, IDID135,771+9.5%−4.8 pts

18Lincoln County, IDID5,603+9.3%−13.0 pts

19Valley County, IDID12,831+9.2%−16.0 pts

20Jerome County, IDID26,362+8.8%−12.4 pts

21Custer County, IDID4,636+8.4%+3.4 pts

22Twin Falls County, IDID97,539+8.3%−11.7 pts

23Butte County, IDID2,783+8.1%+8.8 pts

24Idaho County, IDID17,874+8.1%−4.5 pts

25Shoshone County, IDID14,130+7.3%+8.4 pts

26Cassia County, IDID26,397+7.1%−2.6 pts

27Bingham County, IDID51,153+6.6%−4.5 pts

28Owyhee County, IDID12,661+6.3%−20.6 pts

29Lemhi County, IDID8,474+6.3%−6.9 pts

30Fremont County, IDID14,208+6.1%−1.9 pts

31Minidoka County, IDID22,911+6.0%+1.8 pts

32Latah County, IDID41,842+5.9%−8.2 pts

33Bear Lake County, IDID6,727+5.6%+0.2 pts

34Gooding County, IDID16,446+5.4%−16.2 pts

35Bannock County, IDID91,591+5.3%−9.2 pts

36Blaine County, IDID25,517+5.1%−35.0 pts

37Lewis County, IDID3,704+4.8%−1.7 pts

38Power County, IDID8,246+4.7%−1.7 pts

39Clearwater County, IDID9,118+4.4%−0.6 pts

40Madison County, IDID55,172+4.3%−11.8 pts

41Caribou County, IDID7,252+3.2%−1.7 pts

42Elmore County, IDID29,465+2.8%−34.6 pts

43Nez Perce County, IDID42,905+1.9%−8.9 pts

44Clark County, IDID783-0.9%−35.0 pts

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES