RANKING · 2010 CENSUS · 44 SHOWN OF 44

Fastest growing, Idaho counties · 2010

Idaho counties ranked by population growth since the prior decennial census. 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 densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Teton County, IDID13,254+69.5%−7%

02Canyon County, IDID275,123+43.7%−5%

03Madison County, IDID55,172+36.7%+129%

04Jefferson County, IDID35,297+36.5%+131%

05Ada County, IDID546,141+30.4%−34%

06Valley County, IDID12,831+28.9%+14%

07Lincoln County, IDID5,603+28.8%+29%

08Kootenai County, IDID191,864+27.4%−51%

09Bonneville County, IDID135,771+26.3%+84%

10Jerome County, IDID26,362+22.0%+4%

11Twin Falls County, IDID97,539+20.1%+1%

12Adams County, IDID5,013+14.4%+111%

13Franklin County, IDID15,889+12.9%−43%

14Camas County, IDID1,316+12.7%−65%

15Blaine County, IDID25,517+12.6%−69%

16Fremont County, IDID14,208+12.0%+49%

17Boundary County, IDID13,997+11.2%−40%

18Bonner County, IDID54,420+11.0%−71%

19Gem County, IDID21,773+10.1%−64%

20Payette County, IDID27,824+9.9%−61%

21Bannock County, IDID91,591+9.6%−33%

22Bingham County, IDID51,153+9.3%−16%

23Gooding County, IDID16,446+9.2%−57%

24Owyhee County, IDID12,661+8.3%−69%

25Cassia County, IDID26,397+7.2%−26%

26Latah County, IDID41,842+6.6%−53%

27Boise County, IDID8,545+5.4%−94%

28Nez Perce County, IDID42,905+5.0%−54%

29Idaho County, IDID17,874+4.9%−61%

30Oneida County, IDID5,085+3.9%−78%

31Power County, IDID8,246+3.7%−42%

32Washington County, IDID11,583+2.2%−87%

33Lewis County, IDID3,704+2.0%−70%

34Lemhi County, IDID8,474+1.7%−87%

35Benewah County, IDID10,508+1.2%−92%

36Custer County, IDID4,636+0.6%−88%

37Butte County, IDID2,783-0.3%−58%

38Minidoka County, IDID22,911-0.5%−112%

39Clearwater County, IDID9,118-1.9%−138%

40Clark County, IDID783-3.9%−111%

41Caribou County, IDID7,252-4.7%−195%

42Bear Lake County, IDID6,727-6.6%−223%

43Elmore County, IDID29,465-7.2%−119%

44Shoshone County, IDID14,130-7.3%+536%

SHOWING 1–44 OF 44

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES