RANKING · 2024 ACS · 44 SHOWN OF 44

Youngest by median age, Idaho counties

Idaho counties with the youngest median age (2023 ACS). This list covers the 44 counties in Idaho that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Madison County, IDID55,17221.4+3%

02Latah County, IDID41,84230.6+10%

03Clark County, IDID78331.1+1%

04Jefferson County, IDID35,29732.8+14%

05Elmore County, IDID29,46533.1+14%

06Cassia County, IDID26,39733.2+7%

07Franklin County, IDID15,88933.3+20%

08Bonneville County, IDID135,77133.6+6%

09Jerome County, IDID26,36234.0+3%

10Power County, IDID8,24634.6+9%

11Canyon County, IDID275,12334.9+14%

12Minidoka County, IDID22,91134.9+4%

13Bingham County, IDID51,15335.0+18%

14Bannock County, IDID91,59135.2+18%

15Twin Falls County, IDID97,53936.1+3%

16Camas County, IDID1,31636.8−7%

17Lincoln County, IDID5,60337.2+8%

18Gooding County, IDID16,44638.1+9%

19Ada County, IDID546,14138.4+17%

20Caribou County, IDID7,25238.5+10%

21Payette County, IDID27,82438.9+13%

22Owyhee County, IDID12,66139.0+19%

23Teton County, IDID13,25439.6+27%

24Fremont County, IDID14,20840.0+25%

25Bear Lake County, IDID6,72740.5+13%

26Oneida County, IDID5,08540.8+13%

27Kootenai County, IDID191,86440.9+13%

28Nez Perce County, IDID42,90541.2+8%

29Butte County, IDID2,78341.3+6%

30Boundary County, IDID13,99743.7+14%

31Gem County, IDID21,77344.2+18%

32Shoshone County, IDID14,13044.8+7%

33Washington County, IDID11,58345.0+15%

34Benewah County, IDID10,50845.5+16%

35Blaine County, IDID25,51745.6+22%

36Valley County, IDID12,83146.9+8%

37Bonner County, IDID54,42048.1+18%

38Lewis County, IDID3,70449.0+15%

39Idaho County, IDID17,87449.4+17%

40Clearwater County, IDID9,11852.2+25%

41Lemhi County, IDID8,47453.3+25%

42Boise County, IDID8,54553.4+32%

43Adams County, IDID5,01353.9+21%

44Custer County, IDID4,63660.0+46%

SHOWING 1–44 OF 44

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