RANKING · 2000 CENSUS · 56 SHOWN OF 56

Fastest shrinking, Montana counties · 2000

Montana counties with the steepest population decline since the prior decennial census. 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 growing Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Garfield County, MTMT1,148-19.5%+0%

02Prairie County, MTMT1,112-13.3%+0%

03Sheridan County, MTMT3,436-13.3%+0%

04McCone County, MTMT1,720-13.1%+0%

05Powder River County, MTMT1,781-11.1%+0%

06Daniels County, MTMT1,612-11.0%+0%

07Phillips County, MTMT4,203-10.9%+0%

08Rosebud County, MTMT8,253-10.7%+0%

09Wibaux County, MTMT885-10.3%+0%

10Richland County, MTMT11,377-9.8%+0%

11Carter County, MTMT1,383-9.5%+0%

12Fallon County, MTMT2,959-8.6%+0%

13Deer Lodge County, MTMT9,709-8.4%+0%

14Valley County, MTMT7,385-6.8%+0%

15Liberty County, MTMT1,957-6.0%+0%

16Hill County, MTMT16,167-5.6%+0%

17Petroleum County, MTMT548-5.0%+0%

18Dawson County, MTMT8,692-4.7%+0%

19Roosevelt County, MTMT10,242-3.4%+0%

20Fergus County, MTMT11,825-1.6%+0%

21Treasure County, MTMT728-1.5%+0%

22Pondera County, MTMT6,072-0.1%+0%

23Custer County, MTMT12,034-0.0%+0%

24Wheatland County, MTMT2,100+0.6%+0%

25Silver Bow County, MTMT36,118+2.0%+0%

26Judith Basin County, MTMT2,162+2.1%+0%

27Teton County, MTMT6,496+2.8%+0%

28Cascade County, MTMT85,029+3.4%+0%

29Blaine County, MTMT6,860+4.2%+0%

30Toole County, MTMT5,211+4.4%+0%

31Meagher County, MTMT2,137+6.2%+0%

32Lincoln County, MTMT22,328+7.8%+0%

33Park County, MTMT18,214+7.8%+0%

34Powell County, MTMT7,157+8.5%+0%

35Beaverhead County, MTMT10,043+9.2%+0%

36Glacier County, MTMT13,463+9.3%+0%

37Chouteau County, MTMT5,865+9.5%+0%

38Musselshell County, MTMT5,582+9.5%+0%

39Granite County, MTMT3,658+11.1%+0%

40Big Horn County, MTMT12,752+11.8%+0%

41Yellowstone County, MTMT172,692+14.0%+0%

42Golden Valley County, MTMT844+14.3%+0%

43Madison County, MTMT10,026+14.4%+0%

44Sweet Grass County, MTMT3,762+14.4%+0%

45Mineral County, MTMT5,185+17.2%+0%

46Lewis and Clark County, MTMT75,331+17.3%+0%

47Sanders County, MTMT14,062+18.0%+0%

48Carbon County, MTMT11,466+18.2%+0%

49Missoula County, MTMT123,513+21.8%+0%

50Stillwater County, MTMT9,445+25.4%+0%

51Flathead County, MTMT115,429+25.8%+0%

52Lake County, MTMT33,392+26.0%+0%

53Jefferson County, MTMT13,329+26.6%+0%

54Broadwater County, MTMT8,493+32.2%+0%

55Gallatin County, MTMT128,740+34.4%+0%

56Ravalli County, MTMT48,582+44.2%+0%

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