Middlesex County, CT Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, among the 164.57K Middlesex County, CT population, 33.55K had Italian ancestry (20.39%), 32.35K had Irish ancestry (19.66%), and 27.86K had Other Groups ancestry (16.93%).
The chart below shows the top 10 ancestry groups by percentage, and the table below shows both the population and percentages for many ancestry groups.
You can see similar information for other Connecticut counties, and for Connecticut.
NB: People could belong to one or more ancestry groups.
Data Source: US Census Bureau.
Middlesex County, CT Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| Italian | 33547 | 20.39 |
| Irish | 32353 | 19.66 |
| Other Groups | 27856 | 16.93 |
| Unclassified | 24831 | 15.09 |
| German | 19693 | 11.97 |
| English | 18802 | 11.43 |
| Polish | 17253 | 10.48 |
| French (except Basque) | 8162 | 4.96 |
| American | 7465 | 4.54 |
| Swedish | 4798 | 2.92 |
| French Canadian | 4779 | 2.90 |
| Scottish | 3785 | 2.30 |
| Russian | 2249 | 1.37 |
| European | 2143 | 1.30 |
| Dutch | 2015 | 1.22 |
| Portuguese | 1569 | 0.95 |
| Lithuanian | 1367 | 0.83 |
| Scotch Irish | 1330 | 0.81 |
| West Indian (except Hispanic groups) | 1238 | 0.75 |
| Hungarian | 1067 | 0.65 |
| Jamaican | 1067 | 0.65 |
| Norwegian | 989 | 0.60 |
| Ukrainian | 962 | 0.59 |
| British | 961 | 0.58 |
| Greek | 906 | 0.55 |
| Eastern European | 840 | 0.51 |
| Danish | 797 | 0.48 |
| Subsaharan African | 719 | 0.44 |
| Czech | 616 | 0.37 |
| Welsh | 612 | 0.37 |
| Canadian | 590 | 0.36 |
| Scandinavian | 524 | 0.32 |
| Austrian | 488 | 0.30 |
| Albania | 455 | 0.28 |
| Slovak | 434 | 0.26 |
| Finnish | 360 | 0.22 |
| Swiss | 358 | 0.22 |
| Northern European | 331 | 0.20 |
| Brazilian | 319 | 0.19 |
| Armenian | 286 | 0.17 |
| Nigerian | 253 | 0.15 |
| Czechoslovakian | 237 | 0.14 |
| Lebanese | 230 | 0.14 |
| Belgian | 212 | 0.13 |
| Ghanaian | 178 | 0.11 |
| Latvian | 167 | 0.10 |
| Croatian | 148 | 0.09 |
| Turkish | 137 | 0.08 |
| African | 133 | 0.08 |
| Syrian | 120 | 0.07 |
| Cape Verdean | 111 | 0.07 |
| Romanian | 110 | 0.07 |
| Serbian | 97 | 0.06 |
| Israeli | 84 | 0.05 |
| Haitian | 74 | 0.05 |
| Afghan | 66 | 0.04 |
| Australian | 65 | 0.04 |
| Slovene | 57 | 0.04 |
| Slavic | 49 | 0.03 |
| Trinidadian and Tobagonian | 49 | 0.03 |
| Icelander | 45 | 0.03 |
| Guyanese | 39 | 0.02 |
| Pennsylvania German | 38 | 0.02 |
| Egyptian | 36 | 0.02 |
| Palestinian | 35 | 0.02 |
| Arab | 35 | 0.02 |
| West Indian | 30 | 0.02 |
| Iranian | 29 | 0.02 |
| Moroccan | 28 | 0.02 |
| Basque | 28 | 0.02 |
| Ethiopian | 27 | 0.02 |
| Iraqi | 23 | 0.01 |
| Bulgarian | 22 | 0.01 |
| Estonian | 19 | 0.01 |
| Maltese | 19 | 0.01 |
| Barbadian | 19 | 0.01 |
| Celtic | 15 | 0.01 |
| Yugoslavian | 15 | 0.01 |
| Ugandan | 13 | 0.01 |
| US Virgin Islander | 12 | 0.01 |
| Jordanian | 9 | 0.01 |
| British West Indian | 9 | 0.01 |
| Carpatho Rusyn | 6 | 0.00 |
| Macedonian | 5 | 0.00 |
| Kenyan | 4 | 0.00 |