The following highways are numbered 12C:
New York State Route 365 (NY 365) is an east–west state highway in the central portion of New York, United States. It extends for 44.26 miles (71.23 km) from an intersection with NY 5, east of the Madison County city of Oneida to a junction with NY 8 in the Herkimer County town of Ohio. The portion of NY 365 in western and central Oneida County is a regionally important highway that serves densely populated areas, including the cities of Oneida and Rome. In Verona, a town situated midway between the two locations, NY 365 passes by the Turning Stone Resort & Casino and connects to the New York State Thruway. East of Barneveld, a village in eastern Oneida County, NY 365 is a rural connector road that runs along the Hinckley Reservoir, a waterbody that extends into Herkimer County and Adirondack Park.
New York State Route 5A (NY 5A) is an east–west state highway located within Oneida County, New York, in the United States. It is a 5.59-mile (9.0 km) alternate route of NY 5 between New Hartford and downtown Utica. At its eastern end, NY 5A becomes NY 5S at an interchange with Interstate 790 (I-790), NY 5, NY 8, and NY 12. The route is four lanes wide and passes through mostly commercial areas. When NY 5A was assigned in the mid-1930s, it ended at Yorkville, a village roughly midway between NY 5 in New Hartford and downtown Utica. It was extended to its present length in the 1940s.
New York State Route 291 (NY 291) is a state highway in Oneida County, New York, in the United States. The route extends from an intersection with NY 69 in the town of Whitestown to a junction with NY 365 in the extreme northern tip of the town of Marcy, near the hamlet of Stittville. It is a two-lane highway its entire length. NY 291 meets NY 49, the Utica–Rome Expressway, at an interchange roughly 1 mile (1.6 km) northeast of NY 69. NY 291 provides access to the Marcy Correctional Facility and Mid-State Correctional Facility, both in Marcy.
New York State Route 69 (NY 69) is a state highway extending for 57.42 miles (92.41 km) across the central portion of the U.S. state of New York. The western terminus of the route is at NY 104 in the Oswego County village of Mexico. The eastern terminus is at NY 5A in the Oneida County village of Yorkville, just west of Utica. In between, NY 69 serves the city of Rome.