Duck Island is an unincorporated community located along the border of Hamilton Township and the city of Trenton in Mercer County, in the U.S. state of New Jersey.

One evening in 1938, a young couple parked at a secluded spot on Duck Island were shot after money was demanded of them.

A botched murder attempt on another young couple parked in a lovers' lane in Tullytown, Pennsylvania, led to the arrest of Clarence Hill in 1942.

Motivated by sexual and voyeuristic urges, the serial killer was convicted and sentenced to life in prison for what became known as the "Duck Island Murders".

[5][6] In 1996, there were plans to build a $260 million trash incinerator on Duck Island, but the proposal was defeated by the Mercer County Board of Chosen Freeholders.