King Ferry is a hamlet in the town of Genoa, Cayuga County, New York, United States. The community is located at the intersection of New York State Route 90 and New York State Route 34B, 16.4 miles (26.4 km) north of Ithaca. King Ferry has a post office with ZIP code 13081, which opened on December 15, 1807. King Ferry sits along Cayuga Lake, which is part of the Finger Lakes.