Kerhonkson is a hamlet and census-designated place in Ulster County, New York, United States. The population was 1,722 at the 2020 census. The Kerhonkson CDP is an urban concentration that straddles the border of the town of Rochester and the town of Wawarsing, with the larger portion in Rochester. US 209 is the hamlet's main artery. The western terminus of US 44/ NY 55 is at Route 209 in the Wawarsing portion of the Kerhonkson CDP. The U.S. Postal Service Zip Code of Kerhonkson covers a much larger area of the town of Rochester, as well as part of Wawarsing and a small area of the town of Olive.