RANKING · 2000 CENSUS · 56 SHOWN OF 56

Most sparsely populated, Montana counties · 2000

Montana counties with the fewest residents per square mile (2023). 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 Fastest shrinking Most densely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Garfield County, MTMT1,1480+0%

02Petroleum County, MTMT5480+0%

03Carter County, MTMT1,3830+0%

04Powder River County, MTMT1,7811+0%

05Prairie County, MTMT1,1121+0%

06McCone County, MTMT1,7201+0%

07Meagher County, MTMT2,1371+0%

08Treasure County, MTMT7281+0%

09Golden Valley County, MTMT8441+0%

10Phillips County, MTMT4,2031+0%

11Wibaux County, MTMT8851+0%

12Judith Basin County, MTMT2,1621+0%

13Daniels County, MTMT1,6121+0%

14Chouteau County, MTMT5,8652+0%

15Liberty County, MTMT1,9572+0%

16Valley County, MTMT7,3852+0%

17Wheatland County, MTMT2,1002+0%

18Granite County, MTMT3,6582+0%

19Blaine County, MTMT6,8602+0%

20Beaverhead County, MTMT10,0432+0%

21Fallon County, MTMT2,9592+0%

22Rosebud County, MTMT8,2532+0%

23Madison County, MTMT10,0262+0%

24Sweet Grass County, MTMT3,7622+0%

25Musselshell County, MTMT5,5822+0%

26Sheridan County, MTMT3,4362+0%

27Big Horn County, MTMT12,7523+0%

28Fergus County, MTMT11,8253+0%

29Toole County, MTMT5,2113+0%

30Teton County, MTMT6,4963+0%

31Powell County, MTMT7,1573+0%

32Custer County, MTMT12,0343+0%

33Mineral County, MTMT5,1853+0%

34Broadwater County, MTMT8,4934+0%

35Sanders County, MTMT14,0624+0%

36Dawson County, MTMT8,6924+0%

37Pondera County, MTMT6,0724+0%

38Glacier County, MTMT13,4634+0%

39Roosevelt County, MTMT10,2425+0%

40Stillwater County, MTMT9,4455+0%

41Richland County, MTMT11,3775+0%

42Carbon County, MTMT11,4665+0%

43Lincoln County, MTMT22,3285+0%

44Park County, MTMT18,2146+0%

45Hill County, MTMT16,1676+0%

46Jefferson County, MTMT13,3296+0%

47Deer Lodge County, MTMT9,70913+0%

48Flathead County, MTMT115,42915+0%

49Ravalli County, MTMT48,58215+0%

50Lewis and Clark County, MTMT75,33116+0%

51Lake County, MTMT33,39218+0%

52Gallatin County, MTMT128,74026+0%

53Cascade County, MTMT85,02930+0%

54Missoula County, MTMT123,51337+0%

55Silver Bow County, MTMT36,11848+0%

56Yellowstone County, MTMT172,69249+0%

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