What are the ethnicities of Denmark?

Answer 1

In the period of WWI Denmark (which according to the category of this question is your area of interest) Denmark was almost ethnically almost entirely Danish. The major exceptions being Swedish immigrants in Copenhagen (who BTW mainly came from southern Sweden, and thus ethnically probably was Danish anyway), and to a lessor extant Russian/Polish Jews also in Copenhagen. After WWI a German minority, which hadn't existed since 1864, was reestablished as the border with Germany was moved North after a referendum.

Answer 2

Ethnicities are a tricky subject. For how many generations do you keep your ethnicity after immigating to a new country? Historically the important non-Danish ethnic groups are Frisians, Angels, Germans and Swedes. If you look at current data (Sep 2009) and define inhabitants by their place of birth or that of their non-naturalised parents then the statistics shows these population shares for top-25 countries of origin:

OriginShareDenmark90,2%Turkey1,1%Germany0,6%Iraq0,5%Poland0,5%Libanon0,4%Bosnia-Hercegovina0,4%Pakistan0,4%Jugoslavia0,3%Somalia0,3%Norway0,3%Sweden0,3%Iran0,3%Vietnam0,3%Great Britain0,2%Afghanistan0,2%Sri Lanka0,2%China0,2%Marocco0,2%Thailand0,2%Iceland0,2%Philippines0,2%USA0,1%Ukraine0,1%Holland0,1%Other2,2%

Answer 3

90.5 % of the population are Danes, the remaining 9.5 % consists of mainly Germans, Greeks, Bosnians, Russians, Turks, Kurds and Arabs.