S.C.
Hi K.-
I have been researching preschools in Douglas county for my son who will be 3 in February. Yes, most are for potty trained kids, but I did find this site http://members.tripod.com/hrmothersandmore/id56.html
and they have a list of many preschools and if you need to be potty trained, etc.
Good luck and I hope that information helps.