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. The median across all 56 is +3.0%. Biggest climber in the top 100 since 2020: Lincoln County, MT, up 33 places to #5.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01▲2Broadwater County, MTMT8,493+25.4%−6.8 pts

02▲19Musselshell County, MTMT5,582+18.0%+8.5 pts

03▲3Madison County, MTMT10,026+16.3%+1.9 pts

04▲12Mineral County, MTMT5,185+14.3%−2.8 pts

05▲33Lincoln County, MTMT22,328+13.5%+5.7 pts

06▲5Sanders County, MTMT14,062+13.4%−4.6 pts

07▲23Meagher County, MTMT2,137+10.9%+4.7 pts

08▼3Flathead County, MTMT115,429+10.6%−15.1 pts

09▲6Granite County, MTMT3,658+10.5%−0.5 pts

10▲27Petroleum County, MTMT548+10.5%+15.5 pts

11▲7Jefferson County, MTMT13,329+10.3%−16.3 pts

12▼2Ravalli County, MTMT48,582+10.0%−34.2 pts

13▲9Carbon County, MTMT11,466+9.5%−8.7 pts

14▼13Gallatin County, MTMT128,740+8.2%−26.2 pts

15▼2Lake County, MTMT33,392+7.3%−18.7 pts

16▲17Beaverhead County, MTMT10,043+7.2%−2.1 pts

17▲28Judith Basin County, MTMT2,162+6.9%+4.8 pts

18▼11Lewis and Clark County, MTMT75,331+6.1%−11.2 pts

19▼10Park County, MTMT18,214+6.0%−1.8 pts

20▲24Stillwater County, MTMT9,445+5.4%−20.0 pts

21▲26Powder River County, MTMT1,781+5.1%+16.2 pts

22▼14Yellowstone County, MTMT172,692+4.8%−9.2 pts

23▲28Toole County, MTMT5,211+4.8%+0.4 pts

24▼10Missoula County, MTMT123,513+4.7%−17.0 pts

25▲3Teton County, MTMT6,496+4.3%+1.6 pts

26▲17Fergus County, MTMT11,825+3.3%+4.9 pts

27▲8Deer Lodge County, MTMT9,709+3.1%+11.4 pts

28▲14Powell County, MTMT7,157+3.0%−5.4 pts

29▲19Pondera County, MTMT6,072+3.0%+3.1 pts

30▼3Silver Bow County, MTMT36,118+2.8%+0.8 pts

31▲21Golden Valley County, MTMT844+2.6%−11.7 pts

32▲4Sweet Grass County, MTMT3,762+2.3%−12.1 pts

33▲20Prairie County, MTMT1,112+2.2%+15.5 pts

34▲15Wheatland County, MTMT2,100+1.5%+0.9 pts

35▼4Custer County, MTMT12,034+1.4%+1.4 pts

36▼13Cascade County, MTMT85,029+0.7%−2.7 pts

37▲19Liberty County, MTMT1,957-0.1%+5.9 pts

38▲3Phillips County, MTMT4,203-0.3%+10.6 pts

39▼7Chouteau County, MTMT5,865-0.5%−10.0 pts

40▼1McCone County, MTMT1,720-0.5%+12.6 pts

41▼7Hill County, MTMT16,167-0.9%+4.7 pts

42▲13Rosebud County, MTMT8,253-0.9%+9.8 pts

43▼39Richland County, MTMT11,377-1.0%+8.8 pts

44▲2Garfield County, MTMT1,148-2.1%+17.4 pts

45▼43Carter County, MTMT1,383-2.3%+7.3 pts

46▼20Glacier County, MTMT13,463-2.3%−11.6 pts

47▼22Valley County, MTMT7,385-2.5%+4.3 pts

48▼36Blaine County, MTMT6,860-2.6%−6.8 pts

49▼9Dawson County, MTMT8,692-2.8%+1.9 pts

50▼21Big Horn County, MTMT12,752-2.8%−14.6 pts

51▼31Sheridan County, MTMT3,436-2.9%+10.3 pts

52▼2Daniels County, MTMT1,612-3.0%+8.0 pts

53▼34Fallon County, MTMT2,959-3.0%+5.6 pts

54▼37Treasure County, MTMT728-4.5%−3.0 pts

55▼31Roosevelt County, MTMT10,242-5.1%−1.7 pts

56▼2Wibaux County, MTMT885-5.5%+4.8 pts

SHOWING 1–56 OF 56

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