U.S. Geological SurveyThis map layer shows major ports in the United States, Puerto Rico, and the U.S. Virgin Islands. A port is a city, town, or urban area with a harbor where ships load or unload. This is a revised version of the July 2012 map layer.Shapefilehttps://geodata.wisc.edu/catalog/587A0B8E-BA84-4B4F-A22E-2D511BEDB74EengPublicTransportationNational Ports, United States 2014DatasetsWisconsin2014UW-Madison Robinson Map Library