Maryland State Route 109 is a north-south highway in Western Montgomery County. It runs from Maryland State Route 355, at Hyattstown, to Maryland State Route 107, near Poolesville. MD St Rt 108 passes through the following towns in Montgomery County. Hyattstown Comus Barnesville Beallsville Poolesville MD St Rt 109 is not multi-plexed in Montgomery County. MD St Rt 109 intersects the following highways in Montgomery County. Maryland State Route 355, at Hyattstown. Interstate 270, near Hyattstown. Maryland State Route 28, at Beallsville. Maryland State Route 107, at Poolesville.
