Via LGF and Daniel Pipes I came across this list which details the parts of French towns not controlled by the French - no-go areas, effectively. There are 751 of them.
Check out Marseilles. It's been my view for some time that Marseilles will become the first French town to become an Islamic enclave in western Europe. I had thought this would happen around 20-30 years from now, but judging by the maps I would estimate that it is a lot closer than that.