Port Murray is an unincorporated community and census-designated place located within Mansfield 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 2010 Census, the CDP's population was 129.The community was long known by this name for its location on the Morris Canal and after Colonel James Boyles Murray, the third president of the Morris Canal and Banking Company.