Warren County New Jersey (Vacant / Not In Use) has 9 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Morris Canal, Allamuchy Freight House, Ramsaysburg Homestead, Roseberry, John, Homestead and Shippen Manor.
Some of the country's most noteable architects helped create the Warren County places including Ephraim Beach, Ephraim Morris and Delaware Lackawanna & Western R.R.. Prominent architectural styles found in Warren Country are Georgian, Greek Revival and Colonial.