RANKING · 2010 CENSUS · 56 SHOWN OF 56

Fastest growing, Montana counties · 2010

Montana counties ranked by population growth from the 2000 census to 2010. This list covers the 56 counties in Montana that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Gallatin County, MTMT128,740+32.0%−2.5 pts

02Broadwater County, MTMT8,493+28.0%−4.2 pts

03Flathead County, MTMT115,429+22.1%−3.7 pts

04Yellowstone County, MTMT172,692+14.4%+0.3 pts

05Missoula County, MTMT123,513+14.1%−7.7 pts

06Lewis and Clark County, MTMT75,331+13.8%−3.5 pts

07Jefferson County, MTMT13,329+13.5%−13.1 pts

08Madison County, MTMT10,026+12.3%−2.1 pts

09Sanders County, MTMT14,062+11.6%−6.4 pts

10Ravalli County, MTMT48,582+11.5%−32.7 pts

11Stillwater County, MTMT9,445+11.3%−14.1 pts

12Granite County, MTMT3,658+8.8%−2.3 pts

13Mineral County, MTMT5,185+8.7%−8.4 pts

14Lake County, MTMT33,392+8.4%−17.5 pts

15Liberty County, MTMT1,957+8.4%+14.4 pts

16Carbon County, MTMT11,466+5.5%−12.7 pts

17Lincoln County, MTMT22,328+4.5%−3.2 pts

18Fallon County, MTMT2,959+1.9%+10.4 pts

19Big Horn County, MTMT12,752+1.5%−10.2 pts

20Cascade County, MTMT85,029+1.2%−2.2 pts

21Sweet Grass County, MTMT3,762+1.2%−13.3 pts

22Glacier County, MTMT13,463+1.1%−8.1 pts

23Toole County, MTMT5,211+1.1%−3.3 pts

24Musselshell County, MTMT5,582+0.9%−8.6 pts

25Richland County, MTMT11,377+0.8%+10.6 pts

26Beaverhead County, MTMT10,043+0.5%−8.8 pts

27Petroleum County, MTMT548+0.2%+5.2 pts

28Custer County, MTMT12,034+0.0%+0.0 pts

29Park County, MTMT18,214-0.4%−8.1 pts

30Dawson County, MTMT8,692-1.0%+3.7 pts

31Silver Bow County, MTMT36,118-1.2%−3.1 pts

32Deer Lodge County, MTMT9,709-1.3%+7.1 pts

33Rosebud County, MTMT8,253-1.6%+9.1 pts

34Prairie County, MTMT1,112-1.7%+11.6 pts

35Roosevelt County, MTMT10,242-1.8%+1.6 pts

36Meagher County, MTMT2,137-2.1%−8.3 pts

37Powell County, MTMT7,157-2.1%−10.6 pts

38Fergus County, MTMT11,825-2.6%−1.0 pts

39Chouteau County, MTMT5,865-2.6%−12.1 pts

40Hill County, MTMT16,167-3.5%+2.1 pts

41Valley County, MTMT7,385-4.0%+2.9 pts

42Wheatland County, MTMT2,100-4.0%−4.6 pts

43Pondera County, MTMT6,072-4.2%−4.1 pts

44Wibaux County, MTMT885-4.8%+5.6 pts

45Garfield County, MTMT1,148-5.7%+13.8 pts

46Teton County, MTMT6,496-5.8%−8.5 pts

47Powder River County, MTMT1,781-6.2%+4.9 pts

48Blaine County, MTMT6,860-7.4%−11.6 pts

49Phillips County, MTMT4,203-7.6%+3.3 pts

50Judith Basin County, MTMT2,162-11.0%−13.1 pts

51McCone County, MTMT1,720-12.3%+0.8 pts

52Daniels County, MTMT1,612-13.2%−2.2 pts

53Carter County, MTMT1,383-14.7%−5.2 pts

54Golden Valley County, MTMT844-15.2%−29.4 pts

55Treasure County, MTMT728-16.6%−15.1 pts

56Sheridan County, MTMT3,436-17.6%−4.3 pts

SHOWING 1–56 OF 56

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS