After crossing the Harlem Line, the route dips under the Saw Mill River Parkway and intersects two parallel local streets leading to the parkway's exit 32. NY 120 turns northward here, crossing over the Saw Mill River and leaving Chappaqua for less densely populated areas of the town of New Castle. At north of Chappaqua early 19th-century farmhouses that clustered around the Quaker meeting house that was then the center of Chappaqua, line the road. Today these are listed on the National Register of Historic Places as the Old Chappaqua Historic District.