RANKING · 2010 CENSUS · 56 SHOWN OF 56

Youngest by median age, Montana counties · 2010

Montana counties with the youngest median age (2023 ACS). This list covers the 56 counties in Montana 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

01Big Horn County, MTMT12,75230.5+2%

02Roosevelt County, MTMT10,24231.6−2%

03Glacier County, MTMT13,46331.7+4%

04Gallatin County, MTMT128,74032.5+6%

05Missoula County, MTMT123,51334.3+3%

06Blaine County, MTMT6,86035.1+2%

07Hill County, MTMT16,16735.1+2%

08Rosebud County, MTMT8,25336.5+6%

09Yellowstone County, MTMT172,69238.3+4%

10Cascade County, MTMT85,02938.9+6%

11Lewis and Clark County, MTMT75,33140.9+8%

12Flathead County, MTMT115,42941.2+6%

13Lake County, MTMT33,39241.3+8%

14Richland County, MTMT11,37741.3+5%

15Silver Bow County, MTMT36,11841.3+6%

16Chouteau County, MTMT5,86541.5+6%

17Toole County, MTMT5,21141.5+6%

18Beaverhead County, MTMT10,04342.0+12%

19Custer County, MTMT12,03442.1+7%

20Pondera County, MTMT6,07242.8+11%

21Fallon County, MTMT2,95942.9+4%

22Dawson County, MTMT8,69243.5+6%

23Liberty County, MTMT1,95744.6+7%

24Wheatland County, MTMT2,10044.9+8%

25Powell County, MTMT7,15745.1+14%

26Broadwater County, MTMT8,49345.4+10%

27Park County, MTMT18,21445.4+12%

28Stillwater County, MTMT9,44545.7+12%

29Teton County, MTMT6,49645.8+14%

30Deer Lodge County, MTMT9,70946.0+9%

31Ravalli County, MTMT48,58246.0+12%

32Jefferson County, MTMT13,32946.2+15%

33Garfield County, MTMT1,14846.4+12%

34Valley County, MTMT7,38546.4+11%

35Sweet Grass County, MTMT3,76246.6+13%

36Phillips County, MTMT4,20346.8+15%

37Petroleum County, MTMT54847.3+15%

38Fergus County, MTMT11,82547.8+13%

39Carbon County, MTMT11,46648.1+15%

40Judith Basin County, MTMT2,16248.3+15%

41Golden Valley County, MTMT84448.8+18%

42Lincoln County, MTMT22,32848.9+16%

43McCone County, MTMT1,72048.9+15%

44Wibaux County, MTMT88549.0+16%

45Musselshell County, MTMT5,58249.1+14%

46Powder River County, MTMT1,78149.3+17%

47Madison County, MTMT10,02649.8+15%

48Mineral County, MTMT5,18549.8+21%

49Sanders County, MTMT14,06249.8+13%

50Meagher County, MTMT2,13750.1+17%

51Carter County, MTMT1,38350.2+20%

52Sheridan County, MTMT3,43650.3+12%

53Daniels County, MTMT1,61250.4+7%

54Treasure County, MTMT72851.5+23%

55Granite County, MTMT3,65852.1+22%

56Prairie County, MTMT1,11253.6+10%

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