Port Republic is a city on the Mullica River, located in Atlantic County, New Jersey, United States. As of the 2010 United States Census, the city had a total population of 1,115, reflecting an increase of 78 from the 1,037 counted in the 2000 Census, which had in turn increased by 45 from the 992 counted in the 1990 Census.It is a dry town, where alcohol cannot be sold.