Stewartsville, New Jersey

Stewartsville is an unincorporated community and census-designated place (CDP) located within Greenwich Township in Warren County, in the U.S. state of New Jersey, that was created as part of the 2010 United States census. As of the 2020 census, Stewartsville had a population of 636.

The area is served as United States Postal ServiceZIP Code 08886.

The community of Stewartsville was named after Thomas Stewart, a secretary to George Washington, who purchased property in the area in 1793.