RANKING · 2024 ACS · 56 SHOWN OF 56

Highest Irish population share, Montana counties

Montana counties ranked by the share of all residents who are Irish ancestry (2024 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. The median across all 56 is 12.5%. Biggest climber in the top 100 since 2020: Garfield County, MT, up 36 places to #15.

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SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH SHAREVS 2010

01Silver Bow County, MTMT36,11824.8%−7.8 pts

02Deer Lodge County, MTMT9,70919.8%−6.4 pts

03▲7Jefferson County, MTMT13,32919.0%−0.1 pts

04▲7Park County, MTMT18,21418.5%+2.3 pts

05▲1Madison County, MTMT10,02618.1%−0.7 pts

06▼2Meagher County, MTMT2,13716.7%+3.1 pts

07▲14Wheatland County, MTMT2,10016.5%+5.0 pts

08▲1Broadwater County, MTMT8,49316.4%+0.9 pts

09▲3Lewis and Clark County, MTMT75,33115.9%−3.4 pts

10▼3Judith Basin County, MTMT2,16215.4%−0.8 pts

11▲4Missoula County, MTMT123,51315.3%−2.5 pts

12▼7Powell County, MTMT7,15715.0%−4.1 pts

13▲20Phillips County, MTMT4,20315.0%+1.6 pts

14▲18Prairie County, MTMT1,11214.6%+2.9 pts

15▲36Garfield County, MTMT1,14814.6%−2.3 pts

16▼2Beaverhead County, MTMT10,04314.4%−1.0 pts

17▲1Dawson County, MTMT8,69214.1%−1.4 pts

18▲19Carbon County, MTMT11,46614.0%−2.2 pts

19▲17Stillwater County, MTMT9,44514.0%−0.2 pts

20▲2Gallatin County, MTMT128,74013.7%−4.4 pts

21▲7Toole County, MTMT5,21113.6%−4.0 pts

22▲3Flathead County, MTMT115,42913.3%−1.5 pts

23▲7Yellowstone County, MTMT172,69213.2%−0.7 pts

24▼5Custer County, MTMT12,03413.0%−5.3 pts

25▲9Cascade County, MTMT85,02912.8%−4.3 pts

26▲20Carter County, MTMT1,38312.7%+0.4 pts

27▲4Wibaux County, MTMT88512.5%−0.9 pts

28▲12Sanders County, MTMT14,06212.5%−3.6 pts

29▼21Teton County, MTMT6,49612.4%−2.1 pts

30▼14Ravalli County, MTMT48,58212.4%−3.6 pts

31▲23Liberty County, MTMT1,95712.2%−2.3 pts

32▲18Treasure County, MTMT72812.0%+2.1 pts

33▼9Granite County, MTMT3,65811.9%−8.3 pts

34▼21Mineral County, MTMT5,18511.8%−5.2 pts

35▼8Lincoln County, MTMT22,32811.5%−4.1 pts

36▼1Musselshell County, MTMT5,58211.4%−4.7 pts

37▲4Petroleum County, MTMT54811.2%−2.0 pts

38▲7Sheridan County, MTMT3,43611.2%−0.4 pts

39▲9Lake County, MTMT33,39211.1%−0.4 pts

40▼20Daniels County, MTMT1,61211.0%+2.7 pts

41▼18Richland County, MTMT11,37710.6%−2.4 pts

42▼13Fergus County, MTMT11,82510.5%−2.3 pts

43▼1McCone County, MTMT1,7209.8%−2.2 pts

44▼18Sweet Grass County, MTMT3,7629.6%−3.3 pts

45▼28Powder River County, MTMT1,7819.4%−4.6 pts

46▼43Fallon County, MTMT2,9599.3%−15.5 pts

47▼4Pondera County, MTMT6,0728.9%−4.3 pts

48▼10Rosebud County, MTMT8,2538.6%+2.0 pts

49▼5Valley County, MTMT7,3858.5%−3.9 pts

50▼3Golden Valley County, MTMT8447.7%−10.7 pts

51▼12Chouteau County, MTMT5,8657.1%−5.9 pts

52▼3Hill County, MTMT16,1676.5%−6.2 pts

53▼1Glacier County, MTMT13,4635.4%−1.8 pts

54▲1Blaine County, MTMT6,8604.2%−2.4 pts

55▲1Roosevelt County, MTMT10,2423.8%−2.2 pts

56▼3Big Horn County, MTMT12,7523.7%−1.1 pts

SHOWING 1–56 OF 56

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES