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. The median across all 56 is 702. Biggest climber in the top 100 since 2020: Sanders County, MT, up 7 places to #15.

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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%

09▲1Lake County, MTMT33,3923,602+10%

10▼1Park County, MTMT18,2143,270+28%

11Lincoln County, MTMT22,3282,440−20%

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

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

14▲1Madison County, MTMT10,0261,673+17%

15▲7Sanders County, MTMT14,0621,655−9%

16▲7Carbon County, MTMT11,4661,558−4%

17▼3Custer County, MTMT12,0341,555−26%

18Beaverhead County, MTMT10,0431,4010%

19▲7Stillwater County, MTMT9,4451,285+2%

20▲5Broadwater County, MTMT8,4931,257+53%

21Dawson County, MTMT8,6921,242−10%

22▼3Fergus County, MTMT11,8251,225−17%

23▼7Richland County, MTMT11,3771,196−3%

24▼4Powell County, MTMT7,1571,060−22%

25▼8Hill County, MTMT16,1671,049−49%

26▼2Teton County, MTMT6,496788−11%

27▲1Glacier County, MTMT13,463743−22%

28▼1Rosebud County, MTMT8,253702+17%

29▲3Toole County, MTMT5,211690−24%

30▼1Valley County, MTMT7,385640−30%

31▲7Phillips County, MTMT4,203633+12%

32▲4Musselshell County, MTMT5,582588−16%

33▼3Mineral County, MTMT5,185583−18%

34Pondera County, MTMT6,072539−33%

35▼4Big Horn County, MTMT12,752481−22%

36▼3Chouteau County, MTMT5,865422−44%

37▲2Granite County, MTMT3,658413−33%

38▲5Sheridan County, MTMT3,436410+1%

39▲1Roosevelt County, MTMT10,242405−35%

40▼3Sweet Grass County, MTMT3,762356−25%

41▲3Wheatland County, MTMT2,100339+40%

42▼1Meagher County, MTMT2,137335+21%

43▼1Judith Basin County, MTMT2,1623180%

44▲1Blaine County, MTMT6,860289−32%

45▼10Fallon County, MTMT2,959256−63%

46▲6Liberty County, MTMT1,957238−27%

47▲2Prairie County, MTMT1,112183+43%

48▼1Powder River County, MTMT1,781170−27%

49▲1Carter County, MTMT1,383166+4%

50▼4Daniels County, MTMT1,612164+20%

51▼3McCone County, MTMT1,720163−20%

52▲2Garfield County, MTMT1,148160−23%

53▼2Wibaux County, MTMT885149+4%

54▲1Treasure County, MTMT72888+5%

55▼2Golden Valley County, MTMT84469−54%

56Petroleum County, MTMT54850−37%

SHOWING 1–56 OF 56

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