RANKING · 2010 CENSUS · 56 SHOWN OF 56

Largest Irish population, Montana counties · 2010

Montana counties ranked by the number of residents who are Irish ancestry, from the 2023 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.

MontanaAll states All rankings

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 2000

01Yellowstone County, MTMT172,69220,097–

02Missoula County, MTMT123,51319,086–

03Gallatin County, MTMT128,74015,853–

04Cascade County, MTMT85,02913,744–

05Flathead County, MTMT115,42913,212–

06Lewis and Clark County, MTMT75,33111,894–

07Silver Bow County, MTMT36,11811,030–

08Ravalli County, MTMT48,5826,365–

09Lake County, MTMT33,3923,280–

10Lincoln County, MTMT22,3283,057–

11Park County, MTMT18,2142,548–

12Deer Lodge County, MTMT9,7092,429–

13Jefferson County, MTMT13,3292,134–

14Custer County, MTMT12,0342,113–

15Hill County, MTMT16,1672,037–

16Sanders County, MTMT14,0621,825–

17Carbon County, MTMT11,4661,620–

18Fergus County, MTMT11,8251,474–

19Madison County, MTMT10,0261,432–

20Beaverhead County, MTMT10,0431,406–

21Dawson County, MTMT8,6921,385–

22Powell County, MTMT7,1571,353–

23Stillwater County, MTMT9,4451,264–

24Richland County, MTMT11,3771,235–

25Glacier County, MTMT13,463955–

26Valley County, MTMT7,385909–

27Toole County, MTMT5,211908–

28Teton County, MTMT6,496883–

29Broadwater County, MTMT8,493819–

30Pondera County, MTMT6,072810–

31Chouteau County, MTMT5,865752–

32Mineral County, MTMT5,185710–

33Musselshell County, MTMT5,582699–

34Fallon County, MTMT2,959698–

35Roosevelt County, MTMT10,242624–

36Granite County, MTMT3,658616–

37Big Horn County, MTMT12,752614–

38Rosebud County, MTMT8,253601–

39Phillips County, MTMT4,203564–

40Sweet Grass County, MTMT3,762477–

41Blaine County, MTMT6,860427–

42Sheridan County, MTMT3,436406–

43Liberty County, MTMT1,957328–

44Judith Basin County, MTMT2,162317–

45Meagher County, MTMT2,137276–

46Wheatland County, MTMT2,100243–

47Powder River County, MTMT1,781232–

48Garfield County, MTMT1,148207–

49McCone County, MTMT1,720205–

50Carter County, MTMT1,383159–

51Golden Valley County, MTMT844149–

52Wibaux County, MTMT885143–

53Daniels County, MTMT1,612137–

54Prairie County, MTMT1,112128–

55Treasure County, MTMT72884–

56Petroleum County, MTMT54879–

SHOWING 1–56 OF 56

Download CSV (full list, 56 rows)

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