My guess would be 5-10 just judging by the different sets of tracks I've seen in a small sand pit near where we were hunting. I guess I didn't really "track" them, but I kept close tabs on the sign around that farm and I set up where there seemed to be almost daily activity.
It seems they like they stick in a smaller area up here, my guess would be around 3 square miles...maybe because it is almost strictly big woods with the exception of a farm here and there.
I have 2 hunters coming in tomorrow and 4 more next week. Hopefully I'll have more pictures to share!