RANKING · 2025 ESTIMATES · 56 SHOWN OF 56

Most densely populated, Montana counties

Montana counties ranked by residents per square mile (2025). 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 population gained Most population lost Most sparsely populated

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Yellowstone County, MTMT172,69266–

02Silver Bow County, MTMT36,11850–

03Gallatin County, MTMT128,74049–

04Missoula County, MTMT123,51348–

05Cascade County, MTMT85,02932–

06Flathead County, MTMT115,42923–

07Lake County, MTMT33,39222–

08Lewis and Clark County, MTMT75,33122–

09Ravalli County, MTMT48,58220–

10Deer Lodge County, MTMT9,70913–

11Jefferson County, MTMT13,3298–

12Broadwater County, MTMT8,4937–

13Park County, MTMT18,2146–

14Lincoln County, MTMT22,3286–

15Carbon County, MTMT11,4666–

16Hill County, MTMT16,1676–

17Richland County, MTMT11,3775–

18Stillwater County, MTMT9,4455–

19Sanders County, MTMT14,0625–

20Glacier County, MTMT13,4634–

21Roosevelt County, MTMT10,2424–

22Mineral County, MTMT5,1854–

23Pondera County, MTMT6,0724–

24Dawson County, MTMT8,6924–

25Custer County, MTMT12,0343–

26Powell County, MTMT7,1573–

27Musselshell County, MTMT5,5823–

28Teton County, MTMT6,4963–

29Madison County, MTMT10,0263–

30Fergus County, MTMT11,8253–

31Toole County, MTMT5,2113–

32Big Horn County, MTMT12,7523–

33Granite County, MTMT3,6582–

34Sheridan County, MTMT3,4362–

35Sweet Grass County, MTMT3,7622–

36Fallon County, MTMT2,9592–

37Beaverhead County, MTMT10,0432–

38Rosebud County, MTMT8,2532–

39Blaine County, MTMT6,8602–

40Valley County, MTMT7,3851–

41Chouteau County, MTMT5,8651–

42Wheatland County, MTMT2,1001–

43Liberty County, MTMT1,9571–

44Judith Basin County, MTMT2,1621–

45Daniels County, MTMT1,6121–

46Wibaux County, MTMT8851–

47Meagher County, MTMT2,1371–

48Phillips County, MTMT4,2031–

49Treasure County, MTMT7281–

50Golden Valley County, MTMT8441–

51McCone County, MTMT1,7201–

52Prairie County, MTMT1,1121–

53Powder River County, MTMT1,7811–

54Carter County, MTMT1,3830–

55Petroleum County, MTMT5480–

56Garfield County, MTMT1,1480–

SHOWING 1–56 OF 56

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES