To find out who is your MEP

[Information from the European Commission]

Consult the European Parliament website at the following address:
http://www.europarl.europa.eu
On the first page, click on your preferred language - English, (bottom line, second item) or French. On the resulting page click on "Your MEPs" (along the top).
A map of the EU will appear. Click on France and a list of MEPs by regional constituency will appear. Clicking on any name will give details of that MEP including an address.
Alternatively, you could certainly find out who your local MEPs are by asking at the nearest Mairie.