S.O.
I also found my mom's group on www.meetup.com. This group is called The Leesburg / Ashburn Stay-At-Home Mom's Group and dues are $5 a year. There are around 130 members, so there is always something going on, someplace to go, and someone to hang out with. It's a great group of ladies! We're also very active on the message board.
If Leesburg/Ashburn is too far, I'm sure there are other groups on meetup.com in your area.