Ranking of Colorado Counties By Population with Celtic Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.69K people in Colorado with Celtic ancestry. Among all Colorado counties, Arapahoe County had the highest population with Celtic ancestry (266), followed by Boulder County (243), and El Paso County (210).

The chart and table below shows the top 10 counties with high number of people with Celtic ancestry.

You can see similar information for other states and for other ancestry groups in Colorado.

Data Source: US Census Bureau.
Ranking of Colorado Counties By Population with Celtic Ancestry in 2021
Arapahoe County
Boulder County
El Paso County
Denver County
Larimer County
Jefferson County
Moffat County
Adams County
Eagle County
Pueblo County
Ranking of Colorado Counties By Population with Celtic Ancestry in 2021
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Rank County Population
1 Arapahoe County 266
2 Boulder County 243
3 El Paso County 210
4 Denver County 185
5 Larimer County 147
6 Jefferson County 140
7 Moffat County 79
8 Adams County 66
9 Eagle County 56
10 Pueblo County 55
11 Pitkin County 52
12 Douglas County 46
13 Weld County 44
14 Logan County 22
15 Gunnison County 20
15 Otero County 20
16 Montezuma County 9
17 Broomfield County 7
18 Ouray County 6
19 Fremont County 5
20 Elbert County 4
20 Huerfano County 4
21 Baca County 3
22 Summit County 2