RANKING · 2000 CENSUS · 56 SHOWN OF 56

Most densely populated, Montana counties · 2000

Montana counties ranked by residents per square mile (2000). This list covers the 56 counties in Montana that qualify, ranked against each other statewide. The median across all 56 is 3.

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SAME RANKING BYCities States Metros

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

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 1990

01Yellowstone County, MTMT172,69249+14%

02Silver Bow County, MTMT36,11848+2%

03Missoula County, MTMT123,51337+22%

04Cascade County, MTMT85,02930+3%

05Gallatin County, MTMT128,74026+34%

06Lake County, MTMT33,39218+26%

07Lewis and Clark County, MTMT75,33116+17%

08Ravalli County, MTMT48,58215+44%

09Flathead County, MTMT115,42915+26%

10Deer Lodge County, MTMT9,70913−8%

11Jefferson County, MTMT13,3296+27%

12Hill County, MTMT16,1676−6%

13Park County, MTMT18,2146+8%

14Lincoln County, MTMT22,3285+8%

15Carbon County, MTMT11,4665+18%

16Richland County, MTMT11,3775−10%

17Stillwater County, MTMT9,4455+25%

18Roosevelt County, MTMT10,2425−3%

19Glacier County, MTMT13,4634+9%

20Pondera County, MTMT6,07240%

21Dawson County, MTMT8,6924−5%

22Sanders County, MTMT14,0624+18%

23Broadwater County, MTMT8,4934+32%

24Mineral County, MTMT5,1853+17%

25Custer County, MTMT12,03430%

26Powell County, MTMT7,1573+8%

27Teton County, MTMT6,4963+3%

28Toole County, MTMT5,2113+4%

29Fergus County, MTMT11,8253−2%

30Big Horn County, MTMT12,7523+12%

31Sheridan County, MTMT3,4362−13%

32Musselshell County, MTMT5,5822+10%

33Sweet Grass County, MTMT3,7622+14%

34Madison County, MTMT10,0262+14%

35Rosebud County, MTMT8,2532−11%

36Fallon County, MTMT2,9592−9%

37Beaverhead County, MTMT10,0432+9%

38Blaine County, MTMT6,8602+4%

39Granite County, MTMT3,6582+11%

40Wheatland County, MTMT2,1002+1%

41Valley County, MTMT7,3852−7%

42Liberty County, MTMT1,9572−6%

43Chouteau County, MTMT5,8652+10%

44Daniels County, MTMT1,6121−11%

45Judith Basin County, MTMT2,1621+2%

46Wibaux County, MTMT8851−10%

47Phillips County, MTMT4,2031−11%

48Golden Valley County, MTMT8441+14%

49Treasure County, MTMT7281−1%

50Meagher County, MTMT2,1371+6%

51McCone County, MTMT1,7201−13%

52Prairie County, MTMT1,1121−13%

53Powder River County, MTMT1,7811−11%

54Carter County, MTMT1,3830−10%

55Petroleum County, MTMT5480−5%

56Garfield County, MTMT1,1480−20%

SHOWING 1–56 OF 56

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS