The Unity Barn Raisers have put together a wonderful local food guide for anyone who lives in Central Maine. I think they considered proximity to Unity in terms of which towns to include. Not helpful to the original poster, but I thought someone else might find it helpful. It's great. Not just listings of farmer's markets and CSA's, but also where you can find locally raised meat and that type of thing.
http://www.unitymaine.org/
It's on the sidebar under the link called "Local Food Guide: CSAs and Farmers Markets." Like, did you know that you get organic flours milled to order from Fiddler's Green Farm & Mill in Belfast? All sorts of fun and awesome resources in the guide.
You can also find a statewide directory of CSA farms at MOFGA's website (Maine Organic Farmer and Gardeners Association):
http://www.mofga.org.