RANKING · 2000 CENSUS · 56 SHOWN OF 56

Oldest by median age, Montana counties · 2000

Montana counties ranked by median age of residents (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

RELATEDYoungest 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

01Prairie County, MTMT1,11248.9+0%

02Daniels County, MTMT1,61247.0+0%

03Sheridan County, MTMT3,43645.1+0%

04Sanders County, MTMT14,06244.2+0%

05Madison County, MTMT10,02643.4+0%

06Musselshell County, MTMT5,58243.2+0%

07Granite County, MTMT3,65842.8+0%

08Meagher County, MTMT2,13742.8+0%

09Fergus County, MTMT11,82542.4+0%

10McCone County, MTMT1,72042.4+0%

11Deer Lodge County, MTMT9,70942.3+0%

12Wibaux County, MTMT88542.3+0%

13Lincoln County, MTMT22,32842.1+0%

14Powder River County, MTMT1,78142.1+0%

15Judith Basin County, MTMT2,16242.0+0%

16Carbon County, MTMT11,46641.9+0%

17Carter County, MTMT1,38341.8+0%

18Treasure County, MTMT72841.8+0%

19Valley County, MTMT7,38541.7+0%

20Garfield County, MTMT1,14841.6+0%

21Golden Valley County, MTMT84441.5+0%

22Liberty County, MTMT1,95741.5+0%

23Wheatland County, MTMT2,10041.4+0%

24Broadwater County, MTMT8,49341.3+0%

25Sweet Grass County, MTMT3,76241.2+0%

26Fallon County, MTMT2,95941.1+0%

27Mineral County, MTMT5,18541.1+0%

28Petroleum County, MTMT54841.1+0%

29Ravalli County, MTMT48,58241.1+0%

30Dawson County, MTMT8,69241.0+0%

31Phillips County, MTMT4,20340.8+0%

32Stillwater County, MTMT9,44540.8+0%

33Park County, MTMT18,21440.6+0%

34Jefferson County, MTMT13,32940.2+0%

35Teton County, MTMT6,49640.0+0%

36Powell County, MTMT7,15739.7+0%

37Chouteau County, MTMT5,86539.3+0%

38Custer County, MTMT12,03439.3+0%

39Richland County, MTMT11,37739.2+0%

40Toole County, MTMT5,21139.1+0%

41Flathead County, MTMT115,42939.0+0%

42Silver Bow County, MTMT36,11838.9+0%

43Pondera County, MTMT6,07238.6+0%

44Lake County, MTMT33,39238.2+0%

45Lewis and Clark County, MTMT75,33138.0+0%

46Beaverhead County, MTMT10,04337.6+0%

47Yellowstone County, MTMT172,69236.9+0%

48Cascade County, MTMT85,02936.7+0%

49Hill County, MTMT16,16734.5+0%

50Rosebud County, MTMT8,25334.5+0%

51Blaine County, MTMT6,86034.4+0%

52Missoula County, MTMT123,51333.2+0%

53Roosevelt County, MTMT10,24232.3+0%

54Gallatin County, MTMT128,74030.7+0%

55Glacier County, MTMT13,46330.6+0%

56Big Horn County, MTMT12,75229.8+0%

SHOWING 1–56 OF 56

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