RANKING · 2000 CENSUS · 56 SHOWN OF 56

Oldest by median age, Montana counties · 2000

Montana counties ranked by median age of residents (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

01Prairie County, MTMT1,11248.9+13%

02Daniels County, MTMT1,61247.0+14%

03Sheridan County, MTMT3,43645.1+14%

04Sanders County, MTMT14,06244.2+20%

05Madison County, MTMT10,02643.4+15%

06Musselshell County, MTMT5,58243.2+10%

07Granite County, MTMT3,65842.8+9%

08Meagher County, MTMT2,13742.8+14%

09Fergus County, MTMT11,82542.4+13%

10McCone County, MTMT1,72042.4+18%

11Deer Lodge County, MTMT9,70942.3+11%

12Wibaux County, MTMT88542.3+14%

13Lincoln County, MTMT22,32842.1+19%

14Powder River County, MTMT1,78142.1+15%

15Judith Basin County, MTMT2,16242.0+9%

16Carbon County, MTMT11,46641.9+7%

17Carter County, MTMT1,38341.8+11%

18Treasure County, MTMT72841.8+15%

19Valley County, MTMT7,38541.7+14%

20Garfield County, MTMT1,14841.6+17%

21Golden Valley County, MTMT84441.5+13%

22Liberty County, MTMT1,95741.5+22%

23Wheatland County, MTMT2,10041.4+7%

24Broadwater County, MTMT8,49341.3+13%

25Sweet Grass County, MTMT3,76241.2+4%

26Fallon County, MTMT2,95941.1+17%

27Mineral County, MTMT5,18541.1+14%

28Petroleum County, MTMT54841.1+15%

29Ravalli County, MTMT48,58241.1+9%

30Dawson County, MTMT8,69241.0+15%

31Phillips County, MTMT4,20340.8+20%

32Stillwater County, MTMT9,44540.8+12%

33Park County, MTMT18,21440.6+10%

34Jefferson County, MTMT13,32940.2+15%

35Teton County, MTMT6,49640.0+10%

36Powell County, MTMT7,15739.7+9%

37Chouteau County, MTMT5,86539.3+7%

38Custer County, MTMT12,03439.3+11%

39Richland County, MTMT11,37739.2+18%

40Toole County, MTMT5,21139.1+11%

41Flathead County, MTMT115,42939.0+11%

42Silver Bow County, MTMT36,11838.9+8%

43Pondera County, MTMT6,07238.6+14%

44Lake County, MTMT33,39238.2+10%

45Lewis and Clark County, MTMT75,33138.0+12%

46Beaverhead County, MTMT10,04337.6+18%

47Yellowstone County, MTMT172,69236.9+10%

48Cascade County, MTMT85,02936.7+12%

49Hill County, MTMT16,16734.5+8%

50Rosebud County, MTMT8,25334.5+16%

51Blaine County, MTMT6,86034.4+9%

52Missoula County, MTMT123,51333.2+5%

53Roosevelt County, MTMT10,24232.3+7%

54Gallatin County, MTMT128,74030.7+3%

55Glacier County, MTMT13,46330.6+6%

56Big Horn County, MTMT12,75229.8+6%

SHOWING 1–56 OF 56

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