Ranking of Colorado Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 620.60K people in Colorado with Irish ancestry. Among all Colorado counties, El Paso County had the highest population with Irish ancestry (75.58K), followed by Jefferson County (75.22K), and Denver County (71.62K).
The chart and table below shows the top 10 counties with high number of people with Irish ancestry.
You can see similar information for other states and for other ancestry groups in Colorado.
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Related Topics: Colorado ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Colorado Counties By Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | El Paso County | 75584 |
| 2 | Jefferson County | 75224 |
| 3 | Denver County | 71622 |
| 4 | Arapahoe County | 65298 |
| 5 | Larimer County | 46413 |
| 6 | Douglas County | 44675 |
| 7 | Adams County | 42199 |
| 8 | Boulder County | 39154 |
| 9 | Weld County | 32443 |
| 10 | Mesa County | 18850 |
| 11 | Pueblo County | 15269 |
| 12 | Broomfield County | 9138 |
| 13 | La Plata County | 8203 |
| 14 | Garfield County | 6325 |
| 15 | Eagle County | 5152 |
| 16 | Fremont County | 4860 |
| 17 | Delta County | 3867 |
| 18 | Teller County | 3808 |
| 19 | Montrose County | 3684 |
| 20 | Elbert County | 3158 |
| 21 | Summit County | 2718 |
| 22 | Gunnison County | 2638 |
| 23 | Routt County | 2622 |
| 24 | Montezuma County | 2414 |
| 25 | Morgan County | 2220 |
| 26 | Logan County | 2113 |
| 27 | Otero County | 2029 |
| 28 | Chaffee County | 1918 |
| 29 | Archuleta County | 1876 |
| 30 | Alamosa County | 1815 |
| 31 | Moffat County | 1770 |
| 32 | Pitkin County | 1722 |
| 33 | Park County | 1561 |
| 34 | Clear Creek County | 1513 |
| 35 | Grand County | 1487 |
| 36 | Las Animas County | 1302 |
| 37 | San Miguel County | 1163 |
| 38 | Yuma County | 1111 |
| 39 | Rio Blanco County | 970 |
| 40 | Gilpin County | 919 |
| 41 | Saguache County | 759 |
| 42 | Prowers County | 692 |
| 43 | Rio Grande County | 686 |
| 44 | Custer County | 682 |
| 45 | Lake County | 632 |
| 46 | Lincoln County | 594 |
| 47 | Kit Carson County | 593 |
| 48 | Huerfano County | 589 |
| 49 | Washington County | 532 |
| 50 | Ouray County | 523 |
| 51 | Conejos County | 500 |
| 52 | Crowley County | 450 |
| 53 | Bent County | 368 |
| 54 | Baca County | 339 |
| 55 | Phillips County | 321 |
| 56 | Cheyenne County | 264 |
| 57 | Kiowa County | 233 |
| 58 | Sedgwick County | 214 |
| 59 | Dolores County | 205 |
| 60 | Costilla County | 187 |
| 61 | Hinsdale County | 146 |
| 62 | Mineral County | 135 |
| 63 | Jackson County | 89 |
| 64 | San Juan County | 62 |
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