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. The median across all 44 is +8.3%. Biggest climber in the top 100 since 2020: Camas County, ID, up 40 places to #1.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲40Camas County, IDID1,316+22.2%−14.1 pts

02▲2Canyon County, IDID275,123+19.0%−26.9 pts

03▲13Boundary County, IDID13,997+16.1%−2.4 pts

04▲5Bonner County, IDID54,420+15.5%−22.8 pts

05▲10Adams County, IDID5,013+14.5%+7.7 pts

06▲1Jefferson County, IDID35,297+14.3%−1.5 pts

07▲4Teton County, IDID13,254+14.0%−60.5 pts

08▲2Gem County, IDID21,773+13.9%−14.3 pts

09▲9Boise County, IDID8,545+12.3%−77.8 pts

10▼7Kootenai County, IDID191,864+12.0%−43.8 pts

11▲3Franklin County, IDID15,889+11.9%−10.8 pts

12▲10Oneida County, IDID5,085+11.4%−6.7 pts

13▼11Ada County, IDID546,141+10.3%−35.9 pts

14▲16Washington County, IDID11,583+10.3%−6.4 pts

15▲16Benewah County, IDID10,508+10.3%−5.3 pts

16▼3Payette County, IDID27,824+9.6%−15.6 pts

17▼11Bonneville County, IDID135,771+9.5%−4.8 pts

18▲21Lincoln County, IDID5,603+9.3%−13.0 pts

19▼14Valley County, IDID12,831+9.2%−16.0 pts

20▼3Jerome County, IDID26,362+8.8%−12.4 pts

21▲19Custer County, IDID4,636+8.4%+3.4 pts

22▼14Twin Falls County, IDID97,539+8.3%−11.7 pts

23▲20Butte County, IDID2,783+8.1%+8.8 pts

24▲8Idaho County, IDID17,874+8.1%−4.5 pts

25▲4Shoshone County, IDID14,130+7.3%+8.4 pts

26▼6Cassia County, IDID26,397+7.1%−2.6 pts

27▼1Bingham County, IDID51,153+6.6%−4.5 pts

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

29▲8Lemhi County, IDID8,474+6.3%−6.9 pts

30▲3Fremont County, IDID14,208+6.1%−1.9 pts

31▼12Minidoka County, IDID22,911+6.0%+1.8 pts

32▼8Latah County, IDID41,842+5.9%−8.2 pts

33▼10Bear Lake County, IDID6,727+5.6%+0.2 pts

34▲1Gooding County, IDID16,446+5.4%−16.2 pts

35▼8Bannock County, IDID91,591+5.3%−9.2 pts

36▼24Blaine County, IDID25,517+5.1%−35.0 pts

37▲5Lewis County, IDID3,704+4.8%−1.7 pts

38▼2Power County, IDID8,246+4.7%−1.7 pts

39▼1Clearwater County, IDID9,118+4.4%−0.6 pts

40▼39Madison County, IDID55,172+4.3%−11.8 pts

41▼7Caribou County, IDID7,252+3.2%−1.7 pts

42▼17Elmore County, IDID29,465+2.8%−34.6 pts

43▼22Nez Perce County, IDID42,905+1.9%−8.9 pts

44Clark County, IDID783-0.9%−35.0 pts

SHOWING 1–44 OF 44

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