The following highways are numbered 13A:
County Road 13A (St. Johns County, Florida) 
Nebraska Spur 13A 
County Route 13A (Monmouth County, New Jersey) 
New York State Route 13A 
Secondary State Highway 13A (Washington) (former)
Route 81 is a freeway in the U.S. state of New Jersey. The route is a connector between exit 13A of the New Jersey Turnpike and U.S. Route 1/9 near Newark Liberty International Airport. It runs for 1.18 miles (1.90 km), entirely within the city of Elizabeth in Union County. A freeway called Route S100 was initially proposed on the current alignment of Route 81 in 1938; it, along with its parent Route 100, was never built. The current route was conceived in the 1960s as a freeway replacement for Route 164, which followed Humboldt Avenue, a surface road. It was to be designated Route 76, but was renumbered to Route 81 when Interstate 76 was created in New Jersey.
New York State Route 13 (NY 13) is a state highway that runs mainly north–south for 152.30 miles (245.10 km) between NY 14 in Horseheads and NY 3 west of Pulaski in Central New York in the United States. In between, NY 13 intersects with Interstate 81 (I-81) in Cortland and Pulaski and meets the New York State Thruway (I-90) in Canastota. NY 13 is co-signed with several routes along its routing, most notably NY 34 and NY 96 between Newfield and Ithaca; NY 80 between DeRuyter and Cazenovia; and NY 5 between Chittenango and Canastota.
