RANKING · 2000 CENSUS · 44 SHOWN OF 44

Youngest by median age, Idaho counties · 2000

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, IDID55,17220.7+0%

02Franklin County, IDID15,88927.7+0%

03Latah County, IDID41,84227.9+0%

04Jefferson County, IDID35,29728.8+0%

05Elmore County, IDID29,46529.1+0%

06Bingham County, IDID51,15329.7+0%

07Bannock County, IDID91,59129.8+0%

08Canyon County, IDID275,12330.5+0%

09Clark County, IDID78330.7+0%

10Cassia County, IDID26,39731.1+0%

11Teton County, IDID13,25431.3+0%

12Power County, IDID8,24631.6+0%

13Bonneville County, IDID135,77131.8+0%

14Fremont County, IDID14,20831.9+0%

15Ada County, IDID546,14132.8+0%

16Jerome County, IDID26,36232.9+0%

17Owyhee County, IDID12,66132.9+0%

18Minidoka County, IDID22,91133.5+0%

19Lincoln County, IDID5,60334.3+0%

20Payette County, IDID27,82434.4+0%

21Twin Falls County, IDID97,53934.9+0%

22Caribou County, IDID7,25235.0+0%

23Gooding County, IDID16,44635.1+0%

24Bear Lake County, IDID6,72735.8+0%

25Oneida County, IDID5,08536.0+0%

26Kootenai County, IDID191,86436.1+0%

27Blaine County, IDID25,51737.4+0%

28Gem County, IDID21,77337.5+0%

29Nez Perce County, IDID42,90538.1+0%

30Boundary County, IDID13,99738.3+0%

31Butte County, IDID2,78338.8+0%

32Benewah County, IDID10,50839.2+0%

33Washington County, IDID11,58339.2+0%

34Camas County, IDID1,31639.7+0%

35Boise County, IDID8,54540.4+0%

36Bonner County, IDID54,42040.8+0%

37Custer County, IDID4,63641.2+0%

38Clearwater County, IDID9,11841.7+0%

39Shoshone County, IDID14,13041.8+0%

40Idaho County, IDID17,87442.3+0%

41Lewis County, IDID3,70442.5+0%

42Lemhi County, IDID8,47442.7+0%

43Valley County, IDID12,83143.5+0%

44Adams County, IDID5,01344.4+0%

SHOWING 1–44 OF 44

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