RANKING · 2025 ESTIMATES · 56 SHOWN OF 56

Fastest growing, Montana counties

Montana counties ranked by population growth from the 2020 census to 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Broadwater County, MTMT8,493+25.4%−6.8 pts

02Musselshell County, MTMT5,582+18.0%+8.5 pts

03Madison County, MTMT10,026+16.3%+1.9 pts

04Mineral County, MTMT5,185+14.3%−2.8 pts

05Lincoln County, MTMT22,328+13.5%+5.7 pts

06Sanders County, MTMT14,062+13.4%−4.6 pts

07Meagher County, MTMT2,137+10.9%+4.7 pts

08Flathead County, MTMT115,429+10.6%−15.1 pts

09Granite County, MTMT3,658+10.5%−0.5 pts

10Petroleum County, MTMT548+10.5%+15.5 pts

11Jefferson County, MTMT13,329+10.3%−16.3 pts

12Ravalli County, MTMT48,582+10.0%−34.2 pts

13Carbon County, MTMT11,466+9.5%−8.7 pts

14Gallatin County, MTMT128,740+8.2%−26.2 pts

15Lake County, MTMT33,392+7.3%−18.7 pts

16Beaverhead County, MTMT10,043+7.2%−2.1 pts

17Judith Basin County, MTMT2,162+6.9%+4.8 pts

18Lewis and Clark County, MTMT75,331+6.1%−11.2 pts

19Park County, MTMT18,214+6.0%−1.8 pts

20Stillwater County, MTMT9,445+5.4%−20.0 pts

21Powder River County, MTMT1,781+5.1%+16.2 pts

22Yellowstone County, MTMT172,692+4.8%−9.2 pts

23Toole County, MTMT5,211+4.8%+0.4 pts

24Missoula County, MTMT123,513+4.7%−17.0 pts

25Teton County, MTMT6,496+4.3%+1.6 pts

26Fergus County, MTMT11,825+3.3%+4.9 pts

27Deer Lodge County, MTMT9,709+3.1%+11.4 pts

28Powell County, MTMT7,157+3.0%−5.4 pts

29Pondera County, MTMT6,072+3.0%+3.1 pts

30Silver Bow County, MTMT36,118+2.8%+0.8 pts

31Golden Valley County, MTMT844+2.6%−11.7 pts

32Sweet Grass County, MTMT3,762+2.3%−12.1 pts

33Prairie County, MTMT1,112+2.2%+15.5 pts

34Wheatland County, MTMT2,100+1.5%+0.9 pts

35Custer County, MTMT12,034+1.4%+1.4 pts

36Cascade County, MTMT85,029+0.7%−2.7 pts

37Liberty County, MTMT1,957-0.1%+5.9 pts

38Phillips County, MTMT4,203-0.3%+10.6 pts

39Chouteau County, MTMT5,865-0.5%−10.0 pts

40McCone County, MTMT1,720-0.5%+12.6 pts

41Hill County, MTMT16,167-0.9%+4.7 pts

42Rosebud County, MTMT8,253-0.9%+9.8 pts

43Richland County, MTMT11,377-1.0%+8.8 pts

44Garfield County, MTMT1,148-2.1%+17.4 pts

45Carter County, MTMT1,383-2.3%+7.3 pts

46Glacier County, MTMT13,463-2.3%−11.6 pts

47Valley County, MTMT7,385-2.5%+4.3 pts

48Blaine County, MTMT6,860-2.6%−6.8 pts

49Dawson County, MTMT8,692-2.8%+1.9 pts

50Big Horn County, MTMT12,752-2.8%−14.6 pts

51Sheridan County, MTMT3,436-2.9%+10.3 pts

52Daniels County, MTMT1,612-3.0%+8.0 pts

53Fallon County, MTMT2,959-3.0%+5.6 pts

54Treasure County, MTMT728-4.5%−3.0 pts

55Roosevelt County, MTMT10,242-5.1%−1.7 pts

56Wibaux County, MTMT885-5.5%+4.8 pts

SHOWING 1–56 OF 56

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES