RANKING · 2010 CENSUS · 56 SHOWN OF 56

Highest Irish population share, Montana counties · 2010

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, MTMT36,11832.6%–

02Deer Lodge County, MTMT9,70926.2%–

03Fallon County, MTMT2,95924.8%–

04Granite County, MTMT3,65820.2%–

05Lewis and Clark County, MTMT75,33119.3%–

06Powell County, MTMT7,15719.1%–

07Jefferson County, MTMT13,32919.1%–

08Madison County, MTMT10,02618.9%–

09Golden Valley County, MTMT84418.4%–

10Custer County, MTMT12,03418.3%–

11Gallatin County, MTMT128,74018.1%–

12Missoula County, MTMT123,51317.8%–

13Toole County, MTMT5,21117.7%–

14Cascade County, MTMT85,02917.1%–

15Mineral County, MTMT5,18516.9%–

16Garfield County, MTMT1,14816.9%–

17Carbon County, MTMT11,46616.2%–

18Park County, MTMT18,21416.2%–

19Judith Basin County, MTMT2,16216.1%–

20Musselshell County, MTMT5,58216.1%–

21Sanders County, MTMT14,06216.1%–

22Ravalli County, MTMT48,58215.9%–

23Lincoln County, MTMT22,32815.7%–

24Dawson County, MTMT8,69215.5%–

25Broadwater County, MTMT8,49315.5%–

26Beaverhead County, MTMT10,04315.4%–

27Flathead County, MTMT115,42914.8%–

28Liberty County, MTMT1,95714.5%–

29Teton County, MTMT6,49614.5%–

30Stillwater County, MTMT9,44514.1%–

31Powder River County, MTMT1,78114.0%–

32Yellowstone County, MTMT172,69214.0%–

33Meagher County, MTMT2,13713.6%–

34Phillips County, MTMT4,20313.4%–

35Wibaux County, MTMT88513.4%–

36Petroleum County, MTMT54813.2%–

37Pondera County, MTMT6,07213.2%–

38Chouteau County, MTMT5,86513.0%–

39Richland County, MTMT11,37713.0%–

40Sweet Grass County, MTMT3,76212.8%–

41Fergus County, MTMT11,82512.8%–

42Hill County, MTMT16,16712.7%–

43Valley County, MTMT7,38512.4%–

44Carter County, MTMT1,38312.3%–

45McCone County, MTMT1,72012.0%–

46Prairie County, MTMT1,11211.8%–

47Sheridan County, MTMT3,43611.6%–

48Lake County, MTMT33,39211.5%–

49Wheatland County, MTMT2,10011.5%–

50Treasure County, MTMT7289.9%–

51Daniels County, MTMT1,6128.3%–

52Glacier County, MTMT13,4637.2%–

53Blaine County, MTMT6,8606.6%–

54Rosebud County, MTMT8,2536.6%–

55Roosevelt County, MTMT10,2426.1%–

56Big Horn County, MTMT12,7524.8%–

SHOWING 1–56 OF 56

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