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%−7%

02Broadwater County, MTMT8,493+28.0%−13%

03Flathead County, MTMT115,429+22.1%−14%

04Yellowstone County, MTMT172,692+14.4%+2%

05Missoula County, MTMT123,513+14.1%−35%

06Lewis and Clark County, MTMT75,331+13.8%−20%

07Jefferson County, MTMT13,329+13.5%−49%

08Madison County, MTMT10,026+12.3%−15%

09Sanders County, MTMT14,062+11.6%−35%

10Ravalli County, MTMT48,582+11.5%−74%

11Stillwater County, MTMT9,445+11.3%−56%

12Granite County, MTMT3,658+8.8%−21%

13Mineral County, MTMT5,185+8.7%−49%

14Lake County, MTMT33,392+8.4%−67%

15Liberty County, MTMT1,957+8.4%−241%

16Carbon County, MTMT11,466+5.5%−70%

17Lincoln County, MTMT22,328+4.5%−42%

18Fallon County, MTMT2,959+1.9%−122%

19Big Horn County, MTMT12,752+1.5%−87%

20Cascade County, MTMT85,029+1.2%−65%

21Sweet Grass County, MTMT3,762+1.2%−92%

22Glacier County, MTMT13,463+1.1%−88%

23Toole County, MTMT5,211+1.1%−75%

24Musselshell County, MTMT5,582+0.9%−90%

25Richland County, MTMT11,377+0.8%−108%

26Beaverhead County, MTMT10,043+0.5%−95%

27Petroleum County, MTMT548+0.2%−104%

28Custer County, MTMT12,034+0.0%−400%

29Park County, MTMT18,214-0.4%−105%

30Dawson County, MTMT8,692-1.0%−78%

31Silver Bow County, MTMT36,118-1.2%−160%

32Deer Lodge County, MTMT9,709-1.3%−85%

33Rosebud County, MTMT8,253-1.6%−85%

34Prairie County, MTMT1,112-1.7%−87%

35Roosevelt County, MTMT10,242-1.8%−47%

36Meagher County, MTMT2,137-2.1%−134%

37Powell County, MTMT7,157-2.1%−125%

38Fergus County, MTMT11,825-2.6%+64%

39Chouteau County, MTMT5,865-2.6%−128%

40Hill County, MTMT16,167-3.5%−38%

41Valley County, MTMT7,385-4.0%−42%

42Wheatland County, MTMT2,100-4.0%−796%

43Pondera County, MTMT6,072-4.2%+2915%

44Wibaux County, MTMT885-4.8%−54%

45Garfield County, MTMT1,148-5.7%−71%

46Teton County, MTMT6,496-5.8%−308%

47Powder River County, MTMT1,781-6.2%−44%

48Blaine County, MTMT6,860-7.4%−277%

49Phillips County, MTMT4,203-7.6%−31%

50Judith Basin County, MTMT2,162-11.0%−636%

51McCone County, MTMT1,720-12.3%−6%

52Daniels County, MTMT1,612-13.2%+20%

53Carter County, MTMT1,383-14.7%+55%

54Golden Valley County, MTMT844-15.2%−206%

55Treasure County, MTMT728-16.6%+1017%

56Sheridan County, MTMT3,436-17.6%+33%

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