RANKING · 2024 ACS · 64 SHOWN OF 64

Highest Irish population share, Colorado counties

Colorado counties ranked by the share of all residents who are Irish ancestry (2024 American Community Survey). A concentration measure: Irish residents as a percentage of total population. This list covers the 64 counties in Colorado that qualify, ranked against each other statewide. The median across all 64 is 10.8%. Biggest climber in the top 100 since 2020: Park County, CO, up 42 places to #10.

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SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH SHAREVS 2010

01▲2Mineral County, COCO91018.2%+5.7 pts

02▼1Clear Creek County, COCO8,99417.7%+2.2 pts

03▲1Gilpin County, COCO6,07316.5%+1.1 pts

04▲12San Miguel County, COCO7,75315.8%+1.6 pts

05▲6La Plata County, COCO56,89815.0%−0.4 pts

06▼4Kiowa County, COCO1,41214.8%+5.9 pts

07▲1Hinsdale County, COCO75314.5%+1.4 pts

08▲6Custer County, COCO5,59014.2%−3.4 pts

09▲1Moffat County, COCO13,12214.2%−0.8 pts

10▲42Park County, COCO18,31414.1%−2.5 pts

11▼4Archuleta County, COCO14,30613.9%−0.3 pts

12Cheyenne County, COCO1,71313.8%−1.5 pts

13▲5Pitkin County, COCO16,62513.7%−1.5 pts

14▼8Gunnison County, COCO17,43913.5%−1.1 pts

15Jefferson County, COCO580,45113.4%−2.4 pts

16▲1Douglas County, COCO399,39613.2%−3.5 pts

17▲12Elbert County, COCO30,53413.2%−1.2 pts

18▲16Chaffee County, COCO20,83113.1%−3.6 pts

19▼10Teller County, COCO24,75612.9%−5.1 pts

20▼7Larimer County, COCO377,29212.8%−2.2 pts

21▲4Boulder County, COCO328,56012.6%−1.4 pts

22▼1Mesa County, COCO162,84512.5%−1.8 pts

23▲5Routt County, COCO25,32912.3%−3.8 pts

24Delta County, COCO32,17812.1%+1.0 pts

25▼2Broomfield County, COCO79,17412.0%−2.9 pts

26▼21Rio Blanco County, COCO6,68311.8%−4.6 pts

27▲4Dolores County, COCO2,46611.7%−8.3 pts

28▼8Washington County, COCO4,73211.6%−1.8 pts

29▲10Denver County, COCO740,61311.3%+1.2 pts

30▲6El Paso County, COCO757,04011.2%−2.0 pts

31▼9Yuma County, COCO9,89610.8%−1.7 pts

32▲15Baca County, COCO3,34710.8%−1.8 pts

33▼14Ouray County, COCO5,26510.8%−12.7 pts

34▲17Montezuma County, COCO26,67810.7%−3.5 pts

35▲14San Juan County, COCO81310.6%+0.5 pts

36▲18Lake County, COCO7,55210.5%−1.0 pts

37▲24Sedgwick County, COCO2,24710.4%+2.2 pts

38▼12Saguache County, COCO6,73210.4%−2.2 pts

39▲2Arapahoe County, COCO673,82010.3%−1.1 pts

40▼3Fremont County, COCO50,03910.2%−3.3 pts

41▼8Garfield County, COCO63,47410.0%−4.7 pts

42▲1Lincoln County, COCO5,6459.7%−2.1 pts

43▼3Weld County, COCO378,4269.7%−2.2 pts

44▲9Jackson County, COCO1,2119.5%−4.5 pts

45▼7Alamosa County, COCO16,6889.5%−0.5 pts

46▼2Kit Carson County, COCO7,0699.2%−0.1 pts

47▲8Las Animas County, COCO14,3919.1%−1.1 pts

48▼13Grand County, COCO16,4969.1%−10.7 pts

49▼4Montrose County, COCO44,5919.0%−3.4 pts

50▲7Rio Grande County, COCO11,0878.8%+0.4 pts

51▼1Pueblo County, COCO169,2778.6%−1.6 pts

52▼6Eagle County, COCO54,2918.6%−4.2 pts

53▼11Logan County, COCO20,6548.5%−2.6 pts

54▲5Conejos County, COCO7,5298.4%+1.4 pts

55▲1Adams County, COCO554,6688.3%−1.2 pts

56▼24Otero County, COCO17,6838.2%−1.4 pts

57▼27Summit County, COCO31,5177.7%−7.1 pts

58▼10Morgan County, COCO30,3067.2%−2.3 pts

59▲1Bent County, COCO5,7167.1%−2.5 pts

60▲3Phillips County, COCO4,4206.7%−5.0 pts

61▲3Costilla County, COCO3,6796.3%+0.7 pts

62▼4Crowley County, COCO5,6776.2%−2.0 pts

63▼36Huerfano County, COCO7,0116.0%−6.9 pts

64▼2Prowers County, COCO11,8844.5%−6.8 pts

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