Maine State Route 121 is a north-south highway in North-Central Cumberland County. It runs from U.S. Rt. 302/Maine State Route 35, at Raymond to the Cumberland/Oxford County Line, near Oxford. ME St Rt 121 passes through the following towns in Cumberland County. Raymond Casco ME St Rt 121 is not multi-plexed in Cumberland County. ME St Rt 121 intersects the following highways in Cumberland County. U.S. Rt. 302, at Raymond. Maine State Route 35, at Raymond. Maine State Route 11, at Casco.