RANKING · 2020 CENSUS · 64 SHOWN OF 64

Largest Irish population, Colorado counties · 2020

Colorado counties ranked by the number of residents who are Irish ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 1,703.

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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

01Jefferson County, COCO580,45174,980−10%

02El Paso County, COCO757,04074,130−7%

03Denver County, COCO740,61372,381+24%

04Arapahoe County, COCO673,82065,290+3%

05Larimer County, COCO377,29245,663+5%

06Douglas County, COCO399,39644,198−3%

07Adams County, COCO554,66841,884+3%

08Boulder County, COCO328,56038,091−7%

09Weld County, COCO378,42631,862+11%

10Mesa County, COCO162,84519,400−5%

11Pueblo County, COCO169,27715,516−2%

12Broomfield County, COCO79,1748,574+9%

13La Plata County, COCO56,8987,662−1%

14Garfield County, COCO63,4746,399−21%

15Eagle County, COCO54,2915,180−20%

16Fremont County, COCO50,0394,891−23%

17Montrose County, COCO44,5914,102−18%

18Delta County, COCO32,1783,664+8%

19Teller County, COCO24,7563,613−12%

20Summit County, COCO31,5173,454−14%

21Elbert County, COCO30,5342,965−9%

22Routt County, COCO25,3292,875−22%

23Morgan County, COCO30,3062,6580%

24Gunnison County, COCO17,4392,556+16%

25Montezuma County, COCO26,6782,405−33%

26Pitkin County, COCO16,6252,302−7%

27Logan County, COCO20,6542,213−10%

28Chaffee County, COCO20,8312,103−28%

29Otero County, COCO17,6831,987+11%

30Archuleta County, COCO14,3061,985+15%

31Moffat County, COCO13,1221,852−8%

32Clear Creek County, COCO8,9941,703+20%

33Park County, COCO18,3141,677−38%

34Alamosa County, COCO16,6881,648+7%

35Grand County, COCO16,4961,624−43%

36Yuma County, COCO9,8961,246+1%

37Las Animas County, COCO14,3911,177−26%

38San Miguel County, COCO7,7531,049+1%

39Rio Blanco County, COCO6,6831,026−4%

40Gilpin County, COCO6,073996+26%

41Rio Grande County, COCO11,087789−21%

42Prowers County, COCO11,884775−47%

43Saguache County, COCO6,7327740%

44Huerfano County, COCO7,011773−13%

45Kit Carson County, COCO7,069710−6%

46Lake County, COCO7,552669−18%

47Custer County, COCO5,590643−6%

48Ouray County, COCO5,265625−38%

49Washington County, COCO4,732622−3%

50Conejos County, COCO7,529557−3%

51Lincoln County, COCO5,645554−14%

52Crowley County, COCO5,677400−16%

53Bent County, COCO5,716378−36%

54Baca County, COCO3,347332−31%

55Phillips County, COCO4,420275−46%

56Cheyenne County, COCO1,713262−22%

57Kiowa County, COCO1,412258+76%

58Dolores County, COCO2,466208−49%

59Costilla County, COCO3,679151−24%

60Sedgwick County, COCO2,247150−23%

61Mineral County, COCO910142+11%

62Jackson County, COCO1,211120−42%

63Hinsdale County, COCO753113+77%

64San Juan County, COCO81360−21%

SHOWING 1–64 OF 64

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS