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Have you looked at the campsite search on here?  There are loads of sites and pitch numbers are given, plus reviews, so you can read what 'real people think'.  You can also use the Camping France website to search for smaller sites - Pick your area, then select 'Search by criteria' and then 'Search by number of plots' and whatever else you need from all the other drop-down lists.  That will give you a selection to look through and then you can have a look at the campsite's own website.

If you're going outside of peak season, though, don't necessarily dismiss some of the larger sites - which can be very quiet outside peak season.