RANKING · 2010 CENSUS · 44 SHOWN OF 44

Youngest by median age, Idaho counties · 2010

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, IDID55,17222.6+9%

02Latah County, IDID41,84228.3+1%

03Elmore County, IDID29,46530.0+3%

04Jefferson County, IDID35,29730.0+4%

05Bannock County, IDID91,59131.4+5%

06Franklin County, IDID15,88931.5+14%

07Canyon County, IDID275,12331.6+4%

08Bonneville County, IDID135,77131.7−0%

09Jerome County, IDID26,36231.7−4%

10Bingham County, IDID51,15331.8+7%

11Cassia County, IDID26,39732.0+3%

12Lincoln County, IDID5,60332.0−7%

13Clark County, IDID78332.7+7%

14Power County, IDID8,24633.2+5%

15Teton County, IDID13,25433.2+6%

16Fremont County, IDID14,20833.5+5%

17Gooding County, IDID16,44634.3−2%

18Twin Falls County, IDID97,53934.4−1%

19Ada County, IDID546,14134.8+6%

20Minidoka County, IDID22,91135.3+5%

21Owyhee County, IDID12,66136.0+9%

22Payette County, IDID27,82437.2+8%

23Caribou County, IDID7,25237.7+8%

24Kootenai County, IDID191,86438.9+8%

25Oneida County, IDID5,08539.1+9%

26Blaine County, IDID25,51740.4+8%

27Bear Lake County, IDID6,72740.5+13%

28Nez Perce County, IDID42,90540.8+7%

29Butte County, IDID2,78341.7+7%

30Boundary County, IDID13,99742.8+12%

31Gem County, IDID21,77342.9+14%

32Washington County, IDID11,58343.6+11%

33Camas County, IDID1,31644.3+12%

34Benewah County, IDID10,50844.8+14%

35Bonner County, IDID54,42045.8+12%

36Shoshone County, IDID14,13046.2+11%

37Valley County, IDID12,83146.9+8%

38Custer County, IDID4,63648.0+17%

39Idaho County, IDID17,87448.0+13%

40Lewis County, IDID3,70448.0+13%

41Boise County, IDID8,54548.4+20%

42Clearwater County, IDID9,11849.0+18%

43Lemhi County, IDID8,47449.7+16%

44Adams County, IDID5,01350.0+13%

SHOWING 1–44 OF 44

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