The following highways are numbered 18A:
New York State Route 75 (NY 75) is a north–south state highway in Erie County, New York, in the United States. It extends for 20.85 miles (33.55 km) from an intersection with NY 39 in the Collins hamlet of Collins Center to an interchange with NY 5 in the town of Hamburg. The route passes through the village of Hamburg, which serves as the northern terminus of a 2-mile (3.2 km) overlap between U.S. Route 62 (US 62) and NY 75. Past Hamburg, NY 75 connects to the New York State Thruway northwest of the village before ending a short distance from Lake Erie. The portion of NY 75 south of Hamburg is a two-lane rural highway; in contrast, the section north of the village is four lanes wide and serves commercial and residential areas.