Hi Barbara,
I posted my answer, but don't think you got it. I don't believe you will find a specific area of French Ex patriots. Unlike some nations, we never had an influx of French citizens escaping a regime or form of government the way we have had with other nations. In addition, English is a second language and most French people I have known, also speak French so the oneness to live closer together is not quite the same as it would be if it were a nationality that didn't speak English as well as French. I recommend you call the French consulate and find out if they have any information that might help you. Philadelphia is a huge melting pot and you would probably be very comfortable almost anywhere in the city.
Pam
