French secularism makes it impossible to truly know the demographics of areas of France. Although Marseille is often estimated at having about 20-25% Muslims, recent surveys of student indicate that for young people it may be as high as 30-40% of the population of Marseille. When compared to Paris, the mosques of Marseille seem to be much more accessible from the public transport stops. The narrative of Muslims living on the outskirts of cities can not be seen in this map.
Explore the map below of the mosques of Marseille: