RANKING · 2024 ACS · 56 SHOWN OF 56

Largest Irish population, Montana counties

Montana counties ranked by the number of residents who are Irish ancestry, from the 2024 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.

Irish Americans: full group profile →

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SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

01Yellowstone County, MTMT172,69222,364+11%

02Missoula County, MTMT123,51318,446−3%

03Gallatin County, MTMT128,74016,974+7%

04Flathead County, MTMT115,42914,715+11%

05Lewis and Clark County, MTMT75,33111,681−2%

06Cascade County, MTMT85,02910,801−21%

07Silver Bow County, MTMT36,1188,873−20%

08Ravalli County, MTMT48,5825,771−9%

09Lake County, MTMT33,3923,602+10%

10Park County, MTMT18,2143,270+28%

11Lincoln County, MTMT22,3282,440−20%

12Jefferson County, MTMT13,3292,428+14%

13Deer Lodge County, MTMT9,7091,902−22%

14Madison County, MTMT10,0261,673+17%

15Sanders County, MTMT14,0621,655−9%

16Carbon County, MTMT11,4661,558−4%

17Custer County, MTMT12,0341,555−26%

18Beaverhead County, MTMT10,0431,401−0%

19Stillwater County, MTMT9,4451,285+2%

20Broadwater County, MTMT8,4931,257+53%

21Dawson County, MTMT8,6921,242−10%

22Fergus County, MTMT11,8251,225−17%

23Richland County, MTMT11,3771,196−3%

24Powell County, MTMT7,1571,060−22%

25Hill County, MTMT16,1671,049−49%

26Teton County, MTMT6,496788−11%

27Glacier County, MTMT13,463743−22%

28Rosebud County, MTMT8,253702+17%

29Toole County, MTMT5,211690−24%

30Valley County, MTMT7,385640−30%

31Phillips County, MTMT4,203633+12%

32Musselshell County, MTMT5,582588−16%

33Mineral County, MTMT5,185583−18%

34Pondera County, MTMT6,072539−33%

35Big Horn County, MTMT12,752481−22%

36Chouteau County, MTMT5,865422−44%

37Granite County, MTMT3,658413−33%

38Sheridan County, MTMT3,436410+1%

39Roosevelt County, MTMT10,242405−35%

40Sweet Grass County, MTMT3,762356−25%

41Wheatland County, MTMT2,100339+40%

42Meagher County, MTMT2,137335+21%

43Judith Basin County, MTMT2,162318+0%

44Blaine County, MTMT6,860289−32%

45Fallon County, MTMT2,959256−63%

46Liberty County, MTMT1,957238−27%

47Prairie County, MTMT1,112183+43%

48Powder River County, MTMT1,781170−27%

49Carter County, MTMT1,383166+4%

50Daniels County, MTMT1,612164+20%

51McCone County, MTMT1,720163−20%

52Garfield County, MTMT1,148160−23%

53Wibaux County, MTMT885149+4%

54Treasure County, MTMT72888+5%

55Golden Valley County, MTMT84469−54%

56Petroleum County, MTMT54850−37%

SHOWING 1–56 OF 56

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES