After the village of Avoca, NY 415 parallels I-390 northwestward through the Cohocton River valley to the hamlet of Bloomerville, where CR 6 intersects NY 415 from the southwest. From here, NY 415 meanders its way northward along the base of the valley, crossing the B&H main line, I-390, and the river to reach the small hamlet of Wallace, centered around NY 415's junctions with CR 105 (Henderson Street) and CR 9 (Twelve Mile Creek Road). Another rural stretch brings NY 415 into the town of Cohocton, where the route closely follows the eastern edge of the valley to serve the village of Cohocton. Within the village, NY 415 gains the South Main Street moniker and becomes a two-lane residential street. At Cohocton's central business district, NY 415 turns westward and becomes Maple Avenue. The former right-of-way along Main Street becomes NY 371, which heads northward along North Main Street.