1) Brussels, Belgium 25%
2) Marseille, France 20%
3) Roubaix, France 20%
4) Haskovo, Bulgaria 18%
5) Antwerp, Belgium 17%
6) Medgidia, Romania 16.7%
7) Malmö, Sweden 16%
8) The Hague, The Netherlands 14.7%
9) Shumen, Bulgaria 14.6%
10) Offenbach, Germany 14%
11) Rotterdam, The Netherlands 13.7%
12) Frankfurt, Germany 12.6%
13) London 12.4% is no longer in the EU.
14) Almeria, Spain 12%
https://en.wikipedia.org/wiki/List_of_cities_in_the_European_Union_by_Muslim_population
there doesn't seem to be anything here