Maryland State Route 121 is a short north-south highway in Western Montgomery County. It runs from near Maryland State Route 355, near Clarksburg, to Maryland State Route 117, near Boyds. This serves the Black Hill Regional Park. MD St Rt 121 passes through the following town in Montgomery County. Burdette MD St Rt 121 is multi-plexed in Montgomery County. MD St Rt 121 intersects the following highways in Montgomery County. Maryland State Route 117, near Boyds. Interstate 270, near Clarksburg.
