Nearly 4% of the population of Sweden is Muslim, approximately 300,000 people. There is no dominant ethnic group, but the largest communities are from Iran, Turkey and Bosnia. There are also significant numbers of Iraqis, Palestinians and Albanians.
Muslims live in the major city areas as Stockholm (South and NorthWest of the city), Gothenburg (North, East and South of the city) and Malmoe (City centre, South and East of the city).
http://euro-islam.info/pages/sweden.html