Continuing northbound through Dobbs Ferry, the southbound parkway enters an intersection with Cyrus Field Road before crossing into Irvington. Through Irvington, the Saw Mill River Parkway parallels the Thruway and the river before turning northeast and crossing into Greenburgh and exit 20. Exit 20 serves the New York State Thruway northbound via a flyover ramp. After exit 20, the Saw Mill River Parkway proceeds northeast on a parallel of NY 9A. Continuing alongside the namesake river, the parkway leaves Greenburgh for Elmsford, entering exit 21E and exit 21W, which services NY 119 (Main Street) via separate ramps. After a dart to the northwest, the Saw Mill River Parkway crosses under the Cross Westchester Expressway (I-287). While there is no ramp northbound, exit 22 forks southbound to the westbound Cross Westchester.