RANKING · 2020 CENSUS · 56 SHOWN OF 56

Largest senior population, Montana counties · 2020

Montana counties home to the most residents aged 65 and over as of 2020. Ranked by number of people, not the senior share. This list covers the 56 counties in Montana that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS 2000

01Yellowstone County, MTMT172,69229,336+70%

02Flathead County, MTMT115,42922,377+132%

03Missoula County, MTMT123,51320,461+113%

04Cascade County, MTMT85,02916,133+43%

05Gallatin County, MTMT128,74015,707+172%

06Lewis and Clark County, MTMT75,33113,875+112%

07Ravalli County, MTMT48,58212,342+121%

08Lake County, MTMT33,3927,557+96%

09Silver Bow County, MTMT36,1187,247+31%

10Lincoln County, MTMT22,3285,965+109%

11Sanders County, MTMT14,0623,998+132%

12Park County, MTMT18,2143,986+71%

13Fergus County, MTMT11,8253,006+27%

14Jefferson County, MTMT13,3292,901+180%

15Carbon County, MTMT11,4662,686+67%

16Hill County, MTMT16,1672,639+24%

17Madison County, MTMT10,0262,610+122%

18Custer County, MTMT12,0342,437+22%

19Deer Lodge County, MTMT9,7092,404+36%

20Beaverhead County, MTMT10,0432,262+81%

21Stillwater County, MTMT9,4452,190+85%

22Dawson County, MTMT8,6921,833+14%

23Richland County, MTMT11,3771,792+19%

24Big Horn County, MTMT12,7521,775+63%

25Glacier County, MTMT13,4631,752+43%

26Valley County, MTMT7,3851,735+19%

27Broadwater County, MTMT8,4931,534+113%

28Powell County, MTMT7,1571,512+51%

29Roosevelt County, MTMT10,2421,489+21%

30Teton County, MTMT6,4961,480+38%

31Rosebud County, MTMT8,2531,445+73%

32Pondera County, MTMT6,0721,324+27%

33Mineral County, MTMT5,1851,299+136%

34Musselshell County, MTMT5,5821,289+64%

35Chouteau County, MTMT5,8651,216+17%

36Blaine County, MTMT6,8601,107+22%

37Sweet Grass County, MTMT3,762994+57%

38Phillips County, MTMT4,203987+22%

39Granite County, MTMT3,658966+115%

40Toole County, MTMT5,211896+7%

41Sheridan County, MTMT3,436872−10%

42Judith Basin County, MTMT2,162576+44%

43Meagher County, MTMT2,137549+56%

44Wheatland County, MTMT2,100541+24%

45Fallon County, MTMT2,959540+6%

46Powder River County, MTMT1,781477+39%

47Liberty County, MTMT1,957461+8%

48Daniels County, MTMT1,612420−12%

49McCone County, MTMT1,720408+9%

50Carter County, MTMT1,383378+55%

51Prairie County, MTMT1,112346+20%

52Garfield County, MTMT1,148329+33%

53Wibaux County, MTMT885247+7%

54Golden Valley County, MTMT844233+35%

55Treasure County, MTMT728208+44%

56Petroleum County, MTMT548154+83%

SHOWING 1–56 OF 56

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS