It's a little dated now, but there may be some useful info. It came from the MCNeeds Yahoo listserve, which I'm not sure if it's still active.
Anonymous
07/09/2014 12:33
Subject: Aspergers Support Group (Mont Co)?
Hi. DS is 12 with Aspergers diagnosis and I could likely benefit from a parent support group. Feeling very isolated and like everyone else's kids are happy and well-adjusted. Can anyone recommend a support group? We live in Silver Spring and the nearer the better.
Thanks