RANKING · 2024 ACS · 56 SHOWN OF 56

Youngest by median age, Montana counties

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

01Roosevelt County, MTMT10,24230.9−4%

02Big Horn County, MTMT12,75231.9+7%

03Glacier County, MTMT13,46333.4+9%

04Gallatin County, MTMT128,74034.2+11%

05Hill County, MTMT16,16734.5+0%

06Blaine County, MTMT6,86035.6+3%

07Missoula County, MTMT123,51337.1+12%

08Fallon County, MTMT2,95937.5−9%

09Toole County, MTMT5,21137.7−4%

10Rosebud County, MTMT8,25338.0+10%

11Richland County, MTMT11,37738.4−2%

12Cascade County, MTMT85,02938.6+5%

13Yellowstone County, MTMT172,69239.0+6%

14Liberty County, MTMT1,95739.8−4%

15Silver Bow County, MTMT36,11840.5+4%

16Wibaux County, MTMT88541.0−3%

17Lewis and Clark County, MTMT75,33141.8+10%

18Pondera County, MTMT6,07242.0+9%

19Flathead County, MTMT115,42942.2+8%

20Teton County, MTMT6,49642.3+6%

21Custer County, MTMT12,03442.7+9%

22Chouteau County, MTMT5,86543.0+9%

23Dawson County, MTMT8,69243.0+5%

24Sheridan County, MTMT3,43643.1−4%

25Beaverhead County, MTMT10,04343.2+15%

26Garfield County, MTMT1,14843.3+4%

27Lake County, MTMT33,39244.3+16%

28Valley County, MTMT7,38544.3+6%

29Fergus County, MTMT11,82544.4+5%

30Phillips County, MTMT4,20345.6+12%

31Powell County, MTMT7,15745.8+15%

32Broadwater County, MTMT8,49345.9+11%

33Park County, MTMT18,21446.0+13%

34Wheatland County, MTMT2,10046.2+12%

35Judith Basin County, MTMT2,16246.2+10%

36Stillwater County, MTMT9,44546.7+14%

37Sweet Grass County, MTMT3,76247.0+14%

38Jefferson County, MTMT13,32947.1+17%

39Powder River County, MTMT1,78147.3+12%

40Ravalli County, MTMT48,58248.7+18%

41Deer Lodge County, MTMT9,70949.9+18%

42Mineral County, MTMT5,18550.0+22%

43Carbon County, MTMT11,46650.4+20%

44Golden Valley County, MTMT84450.9+23%

45Musselshell County, MTMT5,58251.3+19%

46Petroleum County, MTMT54851.6+26%

47Treasure County, MTMT72852.0+24%

48Madison County, MTMT10,02652.2+20%

49Lincoln County, MTMT22,32852.8+25%

50Granite County, MTMT3,65853.0+24%

51McCone County, MTMT1,72053.2+25%

52Daniels County, MTMT1,61253.4+14%

53Sanders County, MTMT14,06254.6+24%

54Carter County, MTMT1,38356.9+36%

55Prairie County, MTMT1,11257.8+18%

56Meagher County, MTMT2,13758.3+36%

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