Where exactly is campus?

Campus refers to a schools buildings including their dormitories, housing.

Let me try that again. I am looking for a school that has summer programs that might be willing to extend their housing to a student who might be in Paris on a college work co-op. (not at their specific college)

Check to see if your country has a building at the Cité Universitaire.

When bardo1 asked "where" I read it as "what"... sorry. (I thought maybe it was a term that might not be used in Europe...)

Many universities in europe don't have campuses in the sense of suburban schools (just as many city schools in the US don't have discrete campuses).

If you are looking for recos for student housing you need to contact the schools in question - but I would assume their students receive priority in terms of housing.

Whatever program you are considering will give you that information, any decent one will. If you are considering some program that refuses to even given suggestions or references on how you would get student housing, I wouldn't go there. Any university has their arrangements you can just sign up with them, and all other institutes or even private language programs in Paris that I know of either have places they recommend, if they don't handle the arrangements themself. I've been to 3 and they all had that (of course 2 were universities, so they have foyers/cite universitaire), but even the private school I attended had a regular relationship with a private foyer/hostel, whatever you want to call it.

Such as this one http://www.fiap.asso.fr/index-en.html

I've never tried to rent an apt with a stranger in Paris, so don't know you you'd do that.

AS for you trying to find student housing when you are not really a student, there are private foyers where you are supposed to be a student or official French intern. The above link is open to everyone, here is a nice one, also http://www.fie.fr/

I suspect no one here can say off the top of their head who will let you stay in their student housing next summer. As mentioned you need to contact some colleges and ask. Here's a few in the arrondissements you mentioned:

http://www.ciup.fr/
http://www.upmc.fr/
http://www.aup.edu/
http://www.ensba.fr/
http://www.sciencespo.fr/

Here is a report I made long ago about the Cité Universitaire -- this is exclusively student housing and every summer they allow visiting students to rent rooms (unless there is something like the world athletic championships going on, in which case it houses athletes).

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Thank you all so much... will check some of the links out tomorrow.