RANKING · 2000 CENSUS · 56 SHOWN OF 56

Fastest growing, Montana counties · 2000

Montana counties ranked by population growth from the 1990 census to 2000. 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 –

01Ravalli County, MTMT48,582+44.2%–

02Gallatin County, MTMT128,740+34.4%–

03Broadwater County, MTMT8,493+32.2%–

04Jefferson County, MTMT13,329+26.6%–

05Lake County, MTMT33,392+26.0%–

06Flathead County, MTMT115,429+25.8%–

07Stillwater County, MTMT9,445+25.4%–

08Missoula County, MTMT123,513+21.8%–

09Carbon County, MTMT11,466+18.2%–

10Sanders County, MTMT14,062+18.0%–

11Lewis and Clark County, MTMT75,331+17.3%–

12Mineral County, MTMT5,185+17.2%–

13Sweet Grass County, MTMT3,762+14.4%–

14Madison County, MTMT10,026+14.4%–

15Golden Valley County, MTMT844+14.3%–

16Yellowstone County, MTMT172,692+14.0%–

17Big Horn County, MTMT12,752+11.8%–

18Granite County, MTMT3,658+11.1%–

19Musselshell County, MTMT5,582+9.5%–

20Chouteau County, MTMT5,865+9.5%–

21Glacier County, MTMT13,463+9.3%–

22Beaverhead County, MTMT10,043+9.2%–

23Powell County, MTMT7,157+8.5%–

24Park County, MTMT18,214+7.8%–

25Lincoln County, MTMT22,328+7.8%–

26Meagher County, MTMT2,137+6.2%–

27Toole County, MTMT5,211+4.4%–

28Blaine County, MTMT6,860+4.2%–

29Cascade County, MTMT85,029+3.4%–

30Teton County, MTMT6,496+2.8%–

31Judith Basin County, MTMT2,162+2.1%–

32Silver Bow County, MTMT36,118+2.0%–

33Wheatland County, MTMT2,100+0.6%–

34Custer County, MTMT12,034-0.0%–

35Pondera County, MTMT6,072-0.1%–

36Treasure County, MTMT728-1.5%–

37Fergus County, MTMT11,825-1.6%–

38Roosevelt County, MTMT10,242-3.4%–

39Dawson County, MTMT8,692-4.7%–

40Petroleum County, MTMT548-5.0%–

41Hill County, MTMT16,167-5.6%–

42Liberty County, MTMT1,957-6.0%–

43Valley County, MTMT7,385-6.8%–

44Deer Lodge County, MTMT9,709-8.4%–

45Fallon County, MTMT2,959-8.6%–

46Carter County, MTMT1,383-9.5%–

47Richland County, MTMT11,377-9.8%–

48Wibaux County, MTMT885-10.3%–

49Rosebud County, MTMT8,253-10.7%–

50Phillips County, MTMT4,203-10.9%–

51Daniels County, MTMT1,612-11.0%–

52Powder River County, MTMT1,781-11.1%–

53McCone County, MTMT1,720-13.1%–

54Sheridan County, MTMT3,436-13.3%–

55Prairie County, MTMT1,112-13.3%–

56Garfield County, MTMT1,148-19.5%–

SHOWING 1–56 OF 56

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