New York Central Railroad Adirondack Division Historic District is a national historic district located in Essex, Franklin, Hamilton, Herkimer, Oneida, and St. Lawrence County, New York. The district includes 23 contributing buildings and 18 contributing structures. It encompasses the former Mohawk and Malone Railway that eventually became the Adirondack Division of the New York Central Railroad in 1913. It was listed on the National Register of Historic Places in 1993.