New York State Route 635 is a short north-south highway in Syracuse. It runs from Interstate 690, north to Interstate 90/New York State Thruway. NY St Rt 635 passes through the following town in Onondoga County. Syracuse NY St Rt 635 is not multi-plexed in Onondoga County. NY St Rt 635 intersects the following highways in Onondoga County. Interstate 690, at Syracuse. New York State Route 298, at Syracuse. Interstate 90, (New York State Thruway) at Syracuse.