Seine-Saint-Denis, the poorest region in France at the heart of Paris Olympics.
People Also Ask
Here are the few places you may want to avoid during your stay: Northern 18th and 19th district at night, around Marx Dormoy, Porte de la Chapelle, La Chapelle, Porte de Clignancourt, Porte de la Villette. Montmarte is very safe day and night.
The 7th arrondissement is perhaps the most expensive area to live in Paris, the Eiffel Tower, one of the most famous tourist sites in the world, is located here, as well as many government buildings like ministries, the National Assembly and others. Many dignitaries and VIPs prefer to live in this arrondissement.
It depends on where you would like to go. Paris Gare du Nord is quite safe. There are a lot of people there and even late at night I never had to worry about safety, BUT, do not attract attention with a big camera or any other stuff that can make you look like a tourist.
Be aware of your surroundings, especially when there are crowds or around sensitive areas, like ATM machines. If you're using a machine, notice if someone approaches and do not talk to them. Keep your valuables out of sight.
Montmartre and PigalleMontmartre is a safe neighbourhood. Down the hill, it's Pigalle which is the equivalent of the Red-Light district. As it is very touristy during the day and night you should not have any problems.