New York State Route 314 (NY 314) and Vermont Route 314 (VT 314) are a pair of like-numbered state highways in New York and Vermont in the United States, that are connected by way of the Grand Isle–Plattsburgh Ferry across Lake Champlain and the Thomas MacDonough Highway in Plattsurgh. NY 314 extends for through the Clinton County town of Plattsburgh from Interstate 87 (I-87) exit 39 to U.S. Route 9. NY 314 previously continued another to the ferry landing on Cumberland Head. Its Vermont counterpart is a loop route off of U.S. Route 2 (US 2) through the Grand Isle County towns of South Hero and Grand Isle that connects to the ferry near its midpoint.