Boulder County, CO Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2024.
Based on the US Census ACS-5Yrs estimates, in 2021, among the 328.71K Boulder County, CO population, 81.50K had Unclassified ancestry (24.80%), 69.91K had Other Groups ancestry (21.27%), and 60.54K had German ancestry (18.42%).
The chart below shows the top 10 ancestry groups, and the table below shows both the number and percentages for all ancestry groups.
You can see similar information for other Colorado counties, and for Colorado.
Data Source: US Census - ACS 5-Year Estimates (2021).
Boulder County, CO Population By Ancestry in 2021
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| Ancestry | Number of Ancestry | Percentage of Population (%) |
|---|---|---|
| Unclassified | 81503 | 24.80 |
| Other Groups | 69912 | 21.27 |
| German | 60541 | 18.42 |
| English | 44134 | 13.43 |
| Irish | 39154 | 11.91 |
| Italian | 17847 | 5.43 |
| European | 12284 | 3.74 |
| Polish | 10542 | 3.21 |
| Scottish | 10024 | 3.05 |
| American | 9715 | 2.96 |
| French (except Basque) | 8781 | 2.67 |
| Norwegian | 8478 | 2.58 |
| Swedish | 6944 | 2.11 |
| Dutch | 5471 | 1.66 |
| Russian | 4728 | 1.44 |
| Scotch Irish | 4579 | 1.39 |
| British | 4275 | 1.30 |
| Welsh | 4071 | 1.24 |
| Danish | 3169 | 0.96 |
| Czech | 2477 | 0.75 |
| French Canadian | 2410 | 0.73 |
| Scandinavian | 2157 | 0.66 |
| Eastern European | 2141 | 0.65 |
| Austrian | 1755 | 0.53 |
| Swiss | 1737 | 0.53 |
| Greek | 1675 | 0.51 |
| Lithuanian | 1660 | 0.51 |
| Hungarian | 1644 | 0.50 |
| Northern European | 1522 | 0.46 |
| Ukrainian | 1392 | 0.42 |
| Finnish | 1170 | 0.36 |
| Subsaharan African | 1123 | 0.34 |
| Canadian | 1045 | 0.32 |
| Belgian | 1029 | 0.31 |
| Portuguese | 936 | 0.28 |
| Iranian | 803 | 0.24 |
| Czechoslovakian | 652 | 0.20 |
| Romanian | 604 | 0.18 |
| Slovak | 551 | 0.17 |
| Lebanese | 510 | 0.16 |
| Armenian | 495 | 0.15 |
| Brazilian | 465 | 0.14 |
| Croatian | 418 | 0.13 |
| West Indian (except Hispanic groups) | 375 | 0.11 |
| Icelander | 353 | 0.11 |
| South African | 331 | 0.10 |
| Slovene | 324 | 0.10 |
| Australian | 317 | 0.10 |
| Ethiopian | 298 | 0.09 |
| Israeli | 288 | 0.09 |
| Jamaican | 267 | 0.08 |
| Yugoslavian | 264 | 0.08 |
| African | 263 | 0.08 |
| Celtic | 243 | 0.07 |
| Slavic | 228 | 0.07 |
| Turkish | 206 | 0.06 |
| Serbian | 203 | 0.06 |
| Albania | 176 | 0.05 |
| Arab | 175 | 0.05 |
| Moroccan | 173 | 0.05 |
| Basque | 152 | 0.05 |
| Pennsylvania German | 134 | 0.04 |
| Bulgarian | 130 | 0.04 |
| Latvian | 107 | 0.03 |
| Egyptian | 102 | 0.03 |
| Luxembourger | 96 | 0.03 |
| New Zealander | 90 | 0.03 |
| Cypriot | 87 | 0.03 |
| Afghan | 81 | 0.03 |
| Macedonian | 65 | 0.02 |
| Estonian | 53 | 0.02 |
| German Russian | 53 | 0.02 |
| Maltese | 46 | 0.01 |
| Nigerian | 45 | 0.01 |
| Trinidadian and Tobagonian | 42 | 0.01 |
| Ghanaian | 40 | 0.01 |
| Haitian | 36 | 0.01 |
| Cajun | 35 | 0.01 |
| Alsatian | 33 | 0.01 |
| Jordanian | 25 | 0.01 |
| Iraqi | 22 | 0.01 |
| Syrian | 21 | 0.01 |
| West Indian | 17 | 0.01 |
| Guyanese | 13 | 0.00 |
| British West Indian | 13 | 0.00 |
| Kenyan | 9 | 0.00 |
| Ugandan | 7 | 0.00 |