RANKING · 2020 CENSUS · 56 SHOWN OF 56

Highest Irish population share, Montana counties · 2020

Montana counties ranked by the share of all residents who are Irish ancestry (2020 American Community Survey). A concentration measure: Irish residents as a percentage of total population. 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

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH SHAREVS 2010

01Silver Bow County, MTMT36,11825.6%−7.1 pts

02Deer Lodge County, MTMT9,70922.1%−4.1 pts

03Fallon County, MTMT2,95919.9%−4.9 pts

04Meagher County, MTMT2,13719.8%+6.1 pts

05Powell County, MTMT7,15719.6%+0.4 pts

06Madison County, MTMT10,02618.4%−0.5 pts

07Judith Basin County, MTMT2,16217.9%+1.8 pts

08Teton County, MTMT6,49617.6%+3.2 pts

09Broadwater County, MTMT8,49317.6%+2.1 pts

10Jefferson County, MTMT13,32917.5%−1.6 pts

11Park County, MTMT18,21417.5%+1.3 pts

12Lewis and Clark County, MTMT75,33116.9%−2.4 pts

13Mineral County, MTMT5,18516.7%−0.2 pts

14Beaverhead County, MTMT10,04316.0%+0.6 pts

15Missoula County, MTMT123,51315.3%−2.5 pts

16Ravalli County, MTMT48,58214.9%−1.0 pts

17Powder River County, MTMT1,78114.7%+0.7 pts

18Dawson County, MTMT8,69214.6%−0.9 pts

19Custer County, MTMT12,03414.4%−3.9 pts

20Daniels County, MTMT1,61214.3%+6.0 pts

21Wheatland County, MTMT2,10014.2%+2.7 pts

22Gallatin County, MTMT128,74013.8%−4.2 pts

23Richland County, MTMT11,37713.7%+0.7 pts

24Granite County, MTMT3,65813.7%−6.6 pts

25Flathead County, MTMT115,42913.5%−1.3 pts

26Sweet Grass County, MTMT3,76213.5%+0.7 pts

27Lincoln County, MTMT22,32813.3%−2.4 pts

28Toole County, MTMT5,21113.0%−4.6 pts

29Fergus County, MTMT11,82512.8%−0.1 pts

30Yellowstone County, MTMT172,69212.2%−1.8 pts

31Wibaux County, MTMT88512.0%−1.4 pts

32Prairie County, MTMT1,11211.9%+0.1 pts

33Phillips County, MTMT4,20311.3%−2.1 pts

34Cascade County, MTMT85,02911.3%−5.8 pts

35Musselshell County, MTMT5,58211.3%−4.9 pts

36Stillwater County, MTMT9,44511.2%−2.9 pts

37Carbon County, MTMT11,46610.9%−5.3 pts

38Rosebud County, MTMT8,25310.9%+4.3 pts

39Chouteau County, MTMT5,86510.7%−2.3 pts

40Sanders County, MTMT14,06210.4%−5.6 pts

41Petroleum County, MTMT54810.3%−2.9 pts

42McCone County, MTMT1,72010.3%−1.7 pts

43Pondera County, MTMT6,07210.2%−3.0 pts

44Valley County, MTMT7,38510.1%−2.3 pts

45Sheridan County, MTMT3,4369.8%−1.8 pts

46Carter County, MTMT1,3839.7%−2.6 pts

47Golden Valley County, MTMT8449.6%−8.8 pts

48Lake County, MTMT33,3929.3%−2.2 pts

49Hill County, MTMT16,1679.2%−3.5 pts

50Treasure County, MTMT7289.0%−0.9 pts

51Garfield County, MTMT1,1486.9%−10.0 pts

52Glacier County, MTMT13,4635.7%−1.6 pts

53Big Horn County, MTMT12,7524.8%−0.0 pts

54Liberty County, MTMT1,9574.2%−10.3 pts

55Blaine County, MTMT6,8604.1%−2.5 pts

56Roosevelt County, MTMT10,2423.6%−2.5 pts

SHOWING 1–56 OF 56

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS