RANKING · 2000 CENSUS · 56 SHOWN OF 56

Youngest by median age, Montana counties · 2000

Montana counties with the youngest median age (2000 ACS). This list covers the 56 counties in Montana that qualify, ranked against each other statewide. The median across all 56 is 41.1.

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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

01Big Horn County, MTMT12,75229.8+6%

02Glacier County, MTMT13,46330.6+6%

03Gallatin County, MTMT128,74030.7+3%

04Roosevelt County, MTMT10,24232.3+7%

05Missoula County, MTMT123,51333.2+5%

06Blaine County, MTMT6,86034.4+9%

07Hill County, MTMT16,16734.5+8%

08Rosebud County, MTMT8,25334.5+16%

09Cascade County, MTMT85,02936.7+12%

10Yellowstone County, MTMT172,69236.9+10%

11Beaverhead County, MTMT10,04337.6+18%

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

13Lake County, MTMT33,39238.2+10%

14Pondera County, MTMT6,07238.6+14%

15Silver Bow County, MTMT36,11838.9+8%

16Flathead County, MTMT115,42939.0+11%

17Toole County, MTMT5,21139.1+11%

18Richland County, MTMT11,37739.2+18%

19Chouteau County, MTMT5,86539.3+7%

20Custer County, MTMT12,03439.3+11%

21Powell County, MTMT7,15739.7+9%

22Teton County, MTMT6,49640.0+10%

23Jefferson County, MTMT13,32940.2+15%

24Park County, MTMT18,21440.6+10%

25Phillips County, MTMT4,20340.8+20%

26Stillwater County, MTMT9,44540.8+12%

27Dawson County, MTMT8,69241.0+15%

28Fallon County, MTMT2,95941.1+17%

29Mineral County, MTMT5,18541.1+14%

30Petroleum County, MTMT54841.1+15%

31Ravalli County, MTMT48,58241.1+9%

32Sweet Grass County, MTMT3,76241.2+4%

33Broadwater County, MTMT8,49341.3+13%

34Wheatland County, MTMT2,10041.4+7%

35Golden Valley County, MTMT84441.5+13%

36Liberty County, MTMT1,95741.5+22%

37Garfield County, MTMT1,14841.6+17%

38Valley County, MTMT7,38541.7+14%

39Carter County, MTMT1,38341.8+11%

40Treasure County, MTMT72841.8+15%

41Carbon County, MTMT11,46641.9+7%

42Judith Basin County, MTMT2,16242.0+9%

43Lincoln County, MTMT22,32842.1+19%

44Powder River County, MTMT1,78142.1+15%

45Deer Lodge County, MTMT9,70942.3+11%

46Wibaux County, MTMT88542.3+14%

47Fergus County, MTMT11,82542.4+13%

48McCone County, MTMT1,72042.4+18%

49Granite County, MTMT3,65842.8+9%

50Meagher County, MTMT2,13742.8+14%

51Musselshell County, MTMT5,58243.2+10%

52Madison County, MTMT10,02643.4+15%

53Sanders County, MTMT14,06244.2+20%

54Sheridan County, MTMT3,43645.1+14%

55Daniels County, MTMT1,61247.0+14%

56Prairie County, MTMT1,11248.9+13%

SHOWING 1–56 OF 56

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS