RANKING · 2000 CENSUS · 56 SHOWN OF 56

Youngest by median age, Montana counties · 2000

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, MTMT12,75229.8+0%

02Glacier County, MTMT13,46330.6+0%

03Gallatin County, MTMT128,74030.7+0%

04Roosevelt County, MTMT10,24232.3+0%

05Missoula County, MTMT123,51333.2+0%

06Blaine County, MTMT6,86034.4+0%

07Hill County, MTMT16,16734.5+0%

08Rosebud County, MTMT8,25334.5+0%

09Cascade County, MTMT85,02936.7+0%

10Yellowstone County, MTMT172,69236.9+0%

11Beaverhead County, MTMT10,04337.6+0%

12Lewis and Clark County, MTMT75,33138.0+0%

13Lake County, MTMT33,39238.2+0%

14Pondera County, MTMT6,07238.6+0%

15Silver Bow County, MTMT36,11838.9+0%

16Flathead County, MTMT115,42939.0+0%

17Toole County, MTMT5,21139.1+0%

18Richland County, MTMT11,37739.2+0%

19Chouteau County, MTMT5,86539.3+0%

20Custer County, MTMT12,03439.3+0%

21Powell County, MTMT7,15739.7+0%

22Teton County, MTMT6,49640.0+0%

23Jefferson County, MTMT13,32940.2+0%

24Park County, MTMT18,21440.6+0%

25Phillips County, MTMT4,20340.8+0%

26Stillwater County, MTMT9,44540.8+0%

27Dawson County, MTMT8,69241.0+0%

28Fallon County, MTMT2,95941.1+0%

29Mineral County, MTMT5,18541.1+0%

30Petroleum County, MTMT54841.1+0%

31Ravalli County, MTMT48,58241.1+0%

32Sweet Grass County, MTMT3,76241.2+0%

33Broadwater County, MTMT8,49341.3+0%

34Wheatland County, MTMT2,10041.4+0%

35Golden Valley County, MTMT84441.5+0%

36Liberty County, MTMT1,95741.5+0%

37Garfield County, MTMT1,14841.6+0%

38Valley County, MTMT7,38541.7+0%

39Carter County, MTMT1,38341.8+0%

40Treasure County, MTMT72841.8+0%

41Carbon County, MTMT11,46641.9+0%

42Judith Basin County, MTMT2,16242.0+0%

43Lincoln County, MTMT22,32842.1+0%

44Powder River County, MTMT1,78142.1+0%

45Deer Lodge County, MTMT9,70942.3+0%

46Wibaux County, MTMT88542.3+0%

47Fergus County, MTMT11,82542.4+0%

48McCone County, MTMT1,72042.4+0%

49Granite County, MTMT3,65842.8+0%

50Meagher County, MTMT2,13742.8+0%

51Musselshell County, MTMT5,58243.2+0%

52Madison County, MTMT10,02643.4+0%

53Sanders County, MTMT14,06244.2+0%

54Sheridan County, MTMT3,43645.1+0%

55Daniels County, MTMT1,61247.0+0%

56Prairie County, MTMT1,11248.9+0%

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