RANKING · 2000 CENSUS · 44 SHOWN OF 44

Fastest growing, Idaho counties · 2000

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

01Boise County, IDID8,545+90.1%+0%

02Teton County, IDID13,254+74.4%+0%

03Kootenai County, IDID191,864+55.7%+0%

04Ada County, IDID546,141+46.2%+0%

05Canyon County, IDID275,123+45.9%+0%

06Blaine County, IDID25,517+40.1%+0%

07Bonner County, IDID54,420+38.4%+0%

08Elmore County, IDID29,465+37.4%+0%

09Camas County, IDID1,316+36.3%+0%

10Clark County, IDID783+34.1%+0%

11Gem County, IDID21,773+28.2%+0%

12Owyhee County, IDID12,661+26.8%+0%

13Valley County, IDID12,831+25.2%+0%

14Payette County, IDID27,824+25.2%+0%

15Franklin County, IDID15,889+22.7%+0%

16Lincoln County, IDID5,603+22.2%+0%

17Gooding County, IDID16,446+21.7%+0%

18Jerome County, IDID26,362+21.2%+0%

19Twin Falls County, IDID97,539+20.0%+0%

20Boundary County, IDID13,997+18.5%+0%

21Oneida County, IDID5,085+18.1%+0%

22Washington County, IDID11,583+16.7%+0%

23Madison County, IDID55,172+16.0%+0%

24Jefferson County, IDID35,297+15.8%+0%

25Benewah County, IDID10,508+15.5%+0%

26Bannock County, IDID91,591+14.4%+0%

27Bonneville County, IDID135,771+14.3%+0%

28Latah County, IDID41,842+14.1%+0%

29Lemhi County, IDID8,474+13.1%+0%

30Idaho County, IDID17,874+12.5%+0%

31Bingham County, IDID51,153+11.0%+0%

32Nez Perce County, IDID42,905+10.8%+0%

33Cassia County, IDID26,397+9.6%+0%

34Fremont County, IDID14,208+8.1%+0%

35Adams County, IDID5,013+6.8%+0%

36Lewis County, IDID3,704+6.6%+0%

37Power County, IDID8,246+6.4%+0%

38Bear Lake County, IDID6,727+5.4%+0%

39Custer County, IDID4,636+5.1%+0%

40Clearwater County, IDID9,118+5.0%+0%

41Caribou County, IDID7,252+4.9%+0%

42Minidoka County, IDID22,911+4.2%+0%

43Butte County, IDID2,783-0.7%+0%

44Shoshone County, IDID14,130-1.1%+0%

SHOWING 1–44 OF 44

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