Massachusetts State Route 3 is a north-south highway in Plymouth County. It runs from the Plymouth/Barnstable County Line, near Bourne, to the Norfolk/Plymouth County Line, near Weymouth. MA St Rt 3 passes through the following towns in Plymouth County. Plymouth Kingston Duxbury Pembroke Hanover Rockland Hingham MA St Rt 3 is mutli-plexed in Plymouth County. U.S. Rt. 44, at Plymouth. MA St Rt 3 intersects the following highways in Plymouth County. Massachusetts State Route 3A, at Plymouth. U.S. Rt. 44, at Plymouth. U.S. Rt. 44, at Plymouth.