The following highways are numbered 12B:
New York State Route 12B (NY 12B) is a state highway in the central part of New York in the United States. NY 12B is a north–south highway connecting Oneida County in the north to Chenango County in the south, passing through Madison County in between. The southern terminus of NY 12B is at NY 12 in the village of Sherburne. The northern terminus is at NY 5 in the town of New Hartford. In Madison County, NY 12B directly abuts the campus of Colgate University in the village of Hamilton.
New York State Route 412 (NY 412) is a state highway in Oneida County, New York, in the United States. It serves as a connector between NY 233, which bypasses the village of Clinton to the west, and NY 12B, which passes through the village. NY 412 is a two-lane highway its entire length. It was assigned in the mid-1930s, originally extending from the Hamilton College campus west of NY 233 to Clinton. It was cut back to its present length in the early 1950s.