RANKING · 2025 ESTIMATES · 56 SHOWN OF 56

Most sparsely populated, Montana counties

Montana counties with the fewest residents per square mile (2025). 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

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Garfield County, MTMT1,1480−10%

02Petroleum County, MTMT5480+11%

03Carter County, MTMT1,3830+2%

04Powder River County, MTMT1,7811−4%

05Prairie County, MTMT1,1121−7%

06McCone County, MTMT1,7201−13%

07Golden Valley County, MTMT8441−19%

08Treasure County, MTMT7281−15%

09▲1Phillips County, MTMT4,2031−9%

10▼1Meagher County, MTMT2,1371+11%

11Wibaux County, MTMT8851−17%

12▲1Daniels County, MTMT1,6121−20%

13▼1Judith Basin County, MTMT2,1621−7%

14Liberty County, MTMT1,9571−9%

15Wheatland County, MTMT2,1001−7%

16Chouteau County, MTMT5,8651−2%

17Valley County, MTMT7,3851−4%

18▲1Blaine County, MTMT6,8602−2%

19▼1Rosebud County, MTMT8,2532−12%

20Beaverhead County, MTMT10,0432+9%

21Fallon County, MTMT2,9592+4%

22▲1Sweet Grass County, MTMT3,7622+4%

23▲1Sheridan County, MTMT3,4362−16%

24▼2Granite County, MTMT3,6582+29%

25▲3Big Horn County, MTMT12,7523+1%

26▲1Toole County, MTMT5,2113−1%

27▲2Fergus County, MTMT11,8253−1%

28▼3Madison County, MTMT10,0263+46%

29▲1Teton County, MTMT6,4963+1%

30▼4Musselshell County, MTMT5,5823+24%

31Powell County, MTMT7,15730%

32Custer County, MTMT12,0343+3%

33▲2Dawson County, MTMT8,6924−4%

34▼1Pondera County, MTMT6,0724−5%

35▼1Mineral County, MTMT5,1854+33%

36▲1Roosevelt County, MTMT10,2424−4%

37▲1Glacier County, MTMT13,4634+2%

38▼2Sanders County, MTMT14,0625+37%

39Stillwater County, MTMT9,4455+15%

40▲2Richland County, MTMT11,3775+18%

41▲2Hill County, MTMT16,1676−3%

42▼2Carbon County, MTMT11,4666+20%

43▼2Lincoln County, MTMT22,3286+19%

44▲1Park County, MTMT18,2146+16%

45▼1Broadwater County, MTMT8,4937+94%

46Jefferson County, MTMT13,3298+33%

47Deer Lodge County, MTMT9,70913+3%

48Ravalli County, MTMT48,58220+35%

49▲1Lewis and Clark County, MTMT75,33122+35%

50▲1Lake County, MTMT33,39222+26%

51▼2Flathead County, MTMT115,42923+55%

52Cascade County, MTMT85,02932+6%

53Missoula County, MTMT123,51348+29%

54Gallatin County, MTMT128,74049+90%

55Silver Bow County, MTMT36,11850+4%

56Yellowstone County, MTMT172,69266+34%

SHOWING 1–56 OF 56

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES