Continuing northward, I-684 and NY 120 head due north toward the state line, where NY 120A rejoins its parent route at a junction with King Street just north of the airport. From here, I-684 continues north into Connecticut while NY 120 takes on the King Street name and turns northwest to straddle the state line for roughly as a two-lane road. The route passes over I-684 and the northern tip of Rye Lake and serves an industrial complex in the Connecticut town of Greenwich before the state line turns 90 degrees to the northeast. NY 120 remains on a northwesterly alignment, however, and it crosses the Delaware Aqueduct prior to meeting NY 22 (Mount Kisco Road) on the edge of another Kensico Reservoir inlet. The two routes briefly overlap to cross the inlet on a causeway before splitting on the water body's north shore. From here, NY 120 heads through substantially less developed, mostly wooded areas as it traverses the northeastern edge of the reservoir.