Northeast of where NY 39 enters the county but southwest of the village of Leicester, NY 39 intersects US 20A in an area known as Pine Tavern. The two routes fuse together and head northeast to Leicester, where they descend into a valley surrounding the Genesee River and form a short concurrency with NY 36 in the village center. NY 36 enters from the north and travels east along US 20A and NY 39 for prior to continuing south to Pennsylvania, leaving US 20A and NY 39 to continue east. They serve Cuylerville, a small hamlet on the outskirts of Leicester, before crossing over the Genesee River and climbing the eastern face of the valley to reach a junction with NY 63. Like NY 19A near Castile, NY 63 overlaps US 20A/NY 39 for just before it forks from the route at the southernmost point of the SUNY Geneseo campus.