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 (2023 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.

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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 SHAREVS 2000

01Silver Bow County, MTMT36,11825.6%–

02Deer Lodge County, MTMT9,70922.1%–

03Fallon County, MTMT2,95919.9%–

04Meagher County, MTMT2,13719.8%–

05Powell County, MTMT7,15719.6%–

06Madison County, MTMT10,02618.4%–

07Judith Basin County, MTMT2,16217.9%–

08Teton County, MTMT6,49617.6%–

09Broadwater County, MTMT8,49317.6%–

10Jefferson County, MTMT13,32917.5%–

11Park County, MTMT18,21417.5%–

12Lewis and Clark County, MTMT75,33116.9%–

13Mineral County, MTMT5,18516.7%–

14Beaverhead County, MTMT10,04316.0%–

15Missoula County, MTMT123,51315.3%–

16Ravalli County, MTMT48,58214.9%–

17Powder River County, MTMT1,78114.7%–

18Dawson County, MTMT8,69214.6%–

19Custer County, MTMT12,03414.4%–

20Daniels County, MTMT1,61214.3%–

21Wheatland County, MTMT2,10014.2%–

22Gallatin County, MTMT128,74013.8%–

23Richland County, MTMT11,37713.7%–

24Granite County, MTMT3,65813.7%–

25Flathead County, MTMT115,42913.5%–

26Sweet Grass County, MTMT3,76213.5%–

27Lincoln County, MTMT22,32813.3%–

28Toole County, MTMT5,21113.0%–

29Fergus County, MTMT11,82512.8%–

30Yellowstone County, MTMT172,69212.2%–

31Wibaux County, MTMT88512.0%–

32Prairie County, MTMT1,11211.9%–

33Phillips County, MTMT4,20311.3%–

34Cascade County, MTMT85,02911.3%–

35Musselshell County, MTMT5,58211.3%–

36Stillwater County, MTMT9,44511.2%–

37Carbon County, MTMT11,46610.9%–

38Rosebud County, MTMT8,25310.9%–

39Chouteau County, MTMT5,86510.7%–

40Sanders County, MTMT14,06210.4%–

41Petroleum County, MTMT54810.3%–

42McCone County, MTMT1,72010.3%–

43Pondera County, MTMT6,07210.2%–

44Valley County, MTMT7,38510.1%–

45Sheridan County, MTMT3,4369.8%–

46Carter County, MTMT1,3839.7%–

47Golden Valley County, MTMT8449.6%–

48Lake County, MTMT33,3929.3%–

49Hill County, MTMT16,1679.2%–

50Treasure County, MTMT7289.0%–

51Garfield County, MTMT1,1486.9%–

52Glacier County, MTMT13,4635.7%–

53Big Horn County, MTMT12,7524.8%–

54Liberty County, MTMT1,9574.2%–

55Blaine County, MTMT6,8604.1%–

56Roosevelt County, MTMT10,2423.6%–

SHOWING 1–56 OF 56

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UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES