RANKING · 2000 CENSUS · 44 SHOWN OF 44

Youngest by median age, Idaho counties · 2000

Idaho counties with the youngest median age (2000 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

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 1990

01Madison County, IDID55,17220.7+4%

02Franklin County, IDID15,88927.7−0%

03Latah County, IDID41,84227.9+2%

04Jefferson County, IDID35,29728.8+9%

05Elmore County, IDID29,46529.1+4%

06Bingham County, IDID51,15329.7+6%

07Bannock County, IDID91,59129.8+0%

08Canyon County, IDID275,12330.5−3%

09Clark County, IDID78330.7−6%

10Cassia County, IDID26,39731.1+7%

11Teton County, IDID13,25431.3+2%

12Power County, IDID8,24631.6+5%

13Bonneville County, IDID135,77131.8+10%

14Fremont County, IDID14,20831.9+13%

15Ada County, IDID546,14132.8+3%

16Jerome County, IDID26,36232.9+1%

17Owyhee County, IDID12,66132.9+7%

18Minidoka County, IDID22,91133.5+11%

19Lincoln County, IDID5,60334.3−2%

20Payette County, IDID27,82434.4+0%

21Twin Falls County, IDID97,53934.9+5%

22Caribou County, IDID7,25235.0+14%

23Gooding County, IDID16,44635.1+1%

24Bear Lake County, IDID6,72735.8+15%

25Oneida County, IDID5,08536.0+16%

26Kootenai County, IDID191,86436.1+3%

27Blaine County, IDID25,51737.4+12%

28Gem County, IDID21,77337.5+4%

29Nez Perce County, IDID42,90538.1+7%

30Boundary County, IDID13,99738.3+17%

31Butte County, IDID2,78338.8+17%

32Benewah County, IDID10,50839.2+13%

33Washington County, IDID11,58339.2+6%

34Camas County, IDID1,31639.7+8%

35Boise County, IDID8,54540.4+13%

36Bonner County, IDID54,42040.8+11%

37Custer County, IDID4,63641.2+19%

38Clearwater County, IDID9,11841.7+10%

39Shoshone County, IDID14,13041.8+12%

40Idaho County, IDID17,87442.3+16%

41Lewis County, IDID3,70442.5+17%

42Lemhi County, IDID8,47442.7+12%

43Valley County, IDID12,83143.5+17%

44Adams County, IDID5,01344.4+23%

SHOWING 1–44 OF 44

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS