This U.S. industry comprises establishments primarily engaged in providing water transportation of cargo in coastal waters, on the Great Lakes System, or deep seas between ports of the United States, Puerto Rico, and United States island possessions or protectorates. Marine transportation establishments using the facilities of the St. Lawrence Seaway Authority Commission are considered to be using the Great Lakes Water Transportation System. Establishments primarily engaged in providing coastal and/or Great Lakes barge transportation services are included in this industry.

• Barge transportation, coastal or Great Lakes (including St. Lawrence Seaway)
• Coastal freight transportation to and from domestic ports
• Coastal shipping of freight to and from domestic ports
• Deep sea freight transportation to or from domestic ports (including Puerto Rico)
• Freight shipping on the Great Lakes system (including St. Lawrence Seaway)
• Freight transportation, deep sea, to and from domestic ports
• Great Lakes freight transportation (including St. Lawrence Seaway)
• Intercoastal freight transportation to and from domestic ports
• Lake freight transportation, Great Lakes (including St. Lawrence Seaway)
• Ship chartering with crew, coastal or Great Lakes freight transportation (including St. Lawrence Seaway)
• Shipping freight to and from domestic ports (i.e., coastal, deep sea (including Puerto Rico), Great Lakes system (including St. Lawrence Seaway))