15:38 again. You don't say whether you work, but if you SAH, I would suggest co-op even more. Most 2s programs are 2-3 days a week. On the other days you can do play dates with classmates and that will allow you to get to know other parents. Within the first 2 weeks of school starting, I had play dates with 2 different kids and at that age you pretty much hang out with the other parent the whole time. Now, a couple of months into the school year, between play dates and chatting with parents as we wait for pick up and birthday parties (the whole class is invited at this age) I feel like I've met and actually gotten to know so many people.
Many co-ops are through churches or synagogues. I would not shy away from one that isn't your religion if its a great school.
Hang in there!