The following are moms/parents groups in Montgomery County that we are aware of:
The Wheaton/Glenmont/Silver Spring area has Wheaton Area Moms (WAM FAM)
The Takoma Park area has Takoma Mamas and Families and a related group for those with older kids; they also have a couple of email listservs (moms/parents of silver spring)
There is a Damascus Mom & Dads Group,
There is a small Moms of East Rockville group
Bethesda-Rockville Moms (3.4k members)
North Potomac, Gaithersburg, Darnestown, Germantown Moms (2.9k members)
Bethesda Potomac Rockville Moms (11.8k members)
DMV Moms and Families (10k members)