RANKING · 2020 CENSUS · 56 SHOWN OF 56

Largest American population, Montana counties · 2020

Montana counties ranked by the number of residents who are American ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 56 counties in Montana that qualify, ranked against each other statewide. The median across all 56 is 399.

American ancestry: full group profile →

MontanaAll states All rankings

SAME RANKING BYCities States Metros

RELATEDHighest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share Largest Iraqi population

YEAR2010 2020 2024

RANKPLACESTATEPOPAMERICAN POPULATIONVS 2010

01Yellowstone County, MTMT172,6929,426−34%

02Cascade County, MTMT85,0297,264+98%

03Flathead County, MTMT115,4294,442+8%

04Gallatin County, MTMT128,7404,195+37%

05Missoula County, MTMT123,5134,174−28%

06Lewis and Clark County, MTMT75,3312,908−7%

07Fergus County, MTMT11,8251,562+226%

08Ravalli County, MTMT48,5821,505−55%

09Lake County, MTMT33,3921,310+20%

10Hill County, MTMT16,1671,006+108%

11Carbon County, MTMT11,466882−30%

12Sanders County, MTMT14,062870+130%

13Silver Bow County, MTMT36,118779−27%

14Stillwater County, MTMT9,445730+18%

15Valley County, MTMT7,385712+43%

16Lincoln County, MTMT22,328694+7%

17Chouteau County, MTMT5,865662+481%

18Musselshell County, MTMT5,582628+106%

19Phillips County, MTMT4,203615+45%

20Dawson County, MTMT8,692606+4%

21Custer County, MTMT12,034525−68%

22Powell County, MTMT7,157508+54%

23Richland County, MTMT11,377505−39%

24Beaverhead County, MTMT10,043454+44%

25Deer Lodge County, MTMT9,709452+88%

26Jefferson County, MTMT13,329432−7%

27Park County, MTMT18,214422−64%

28Wheatland County, MTMT2,100399−46%

29Garfield County, MTMT1,148385+198%

30Blaine County, MTMT6,860370+189%

31Teton County, MTMT6,496344+30%

32Broadwater County, MTMT8,493273+120%

33Rosebud County, MTMT8,253271−88%

34Judith Basin County, MTMT2,162255+650%

35Madison County, MTMT10,026251+15%

36Sheridan County, MTMT3,436222+27%

37Glacier County, MTMT13,463219+20%

38McCone County, MTMT1,720205−6%

39Pondera County, MTMT6,072202−41%

40Roosevelt County, MTMT10,242201+53%

41Big Horn County, MTMT12,752198−87%

42Mineral County, MTMT5,185165+31%

43Granite County, MTMT3,658160−34%

44Toole County, MTMT5,211160−14%

45Fallon County, MTMT2,959125+1150%

46Carter County, MTMT1,383114+104%

47Powder River County, MTMT1,781112−78%

48Petroleum County, MTMT548108+414%

49Daniels County, MTMT1,612101+432%

50Sweet Grass County, MTMT3,76299−79%

51Liberty County, MTMT1,95765+103%

52Prairie County, MTMT1,11262−60%

53Treasure County, MTMT72846−87%

54Golden Valley County, MTMT84444−40%

55Meagher County, MTMT2,13742−34%

56Wibaux County, MTMT88541−68%

SHOWING 1–56 OF 56

Download CSV (full list, 56 rows)

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