Jefferson County, WI Population By Ancestry in 2021 (ACS-5Yrs)

Updated on March 4, 2024.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 84.81K Jefferson County, WI population, 40.22K had German ancestry (47.43%), 16.15K had Unclassified ancestry (19.05%), and 10.26K had Other Groups ancestry (12.10%).

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 Wisconsin counties, and for Wisconsin.

Jefferson County, WI Percentages of Ancestry of Population in 2021
German
Unclassified
Other Groups
Irish
Polish
English
Norwegian
American
Italian
French (except Basque)
Jefferson County, WI Population By Ancestry in 2021
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Ancestry Number of Ancestry Percentage of Population (%)
German 40221 47.43
Unclassified 16153 19.05
Other Groups 10258 12.10
Irish 9778 11.53
Polish 5952 7.02
English 5920 6.98
Norwegian 5480 6.46
American 3118 3.68
Italian 2811 3.32
French (except Basque) 2151 2.54
Swedish 1345 1.59
Scottish 1213 1.43
Dutch 1197 1.41
European 1008 1.19
Swiss 884 1.04
Czech 655 0.77
Danish 452 0.53
Russian 413 0.49
Welsh 395 0.47
British 380 0.45
French Canadian 375 0.44
Scandinavian 365 0.43
Hungarian 329 0.39
Belgian 326 0.38
Scotch Irish 306 0.36
Austrian 240 0.28
Serbian 237 0.28
Lithuanian 219 0.26
Finnish 209 0.25
Slovak 140 0.17
Slovene 140 0.17
Greek 132 0.16
Northern European 131 0.15
Canadian 126 0.15
Albania 116 0.14
Croatian 101 0.12
Lebanese 100 0.12
Ukrainian 96 0.11
Eastern European 93 0.11
German Russian 78 0.09
Subsaharan African 67 0.08
Yugoslavian 57 0.07
Armenian 51 0.06
African 46 0.05
Czechoslovakian 43 0.05
Iranian 42 0.05
Australian 38 0.05
Romanian 35 0.04
West Indian (except Hispanic groups) 34 0.04
Trinidadian and Tobagonian 26 0.03
Latvian 20 0.02
Portuguese 14 0.02
Celtic 10 0.01
Liberian 10 0.01
Estonian 8 0.01
Luxembourger 8 0.01
Cajun 6 0.01
Israeli 6 0.01
Ethiopian 6 0.01
Belizean 6 0.01
Arab 5 0.01
Nigerian 5 0.01
Assyrian/Chaldean/Syriac 4 0.01
Pennsylvania German 4 0.01
Syrian 3 0.00
Jamaican 2 0.00
Slavic 1 0.00