total: 6,465,799 km paved: 4,209,835 km (includes 75,040 km of expressways) unpaved: 2,255,964 km (2007)
Waterways:
41,009 km (19,312 km used for commerce) note: Saint Lawrence Seaway of 3,769 km, including the Saint Lawrence River of 3,058 km, shared with Canada (2007)
Merchant marine:
total: 422 by type: barge carrier 6, bulk carrier 61, cargo 69, carrier 2, chemical tanker 22, container 81, passenger 19, passenger/cargo 59, petroleum tanker 53, refrigerated cargo 3, roll on/roll off 25, vehicle carrier 22 foreign-owned: 74 (Australia 1, Denmark 31, Germany 5, Japan 7, Malaysia 2, Netherlands 1, Norway 9, Singapore 12, Sweden 5, UK 1) registered in other countries: 732 (Antigua and Barbuda 8, Australia 2, Bahamas 106, Bermuda 23, Cambodia 6, Canada 10, Cayman Islands 42, Comoros 2, Cyprus 5, Ecuador 1, Greece 8, Hong Kong 29, Ireland 2, Isle of Man 4, Italy 17, South Korea 7, Liberia 98, Luxembourg 4, Malta 23, Marshall Islands 123, Netherlands 14, Netherlands Antilles 1, Norway 1, Norway 7, Panama 126, Portugal 1, Puerto Rico 3, Russia 1, Saint Vincent and the Grenadines 18, Sierra Leone 1, Singapore 22, Trinidad and Tobago 1, Tuvalu 1, UK 12, Vanuatu 1, unknown 2) (2008)
Ports and terminals:
Corpus Christi, Duluth, Hampton Roads, Houston, Long Beach, Los
Angeles, New York, Philadelphia, Tampa, Texas City
Military
United States
Military branches:
US Army, US Navy (includes Marine Corps), US Air Force, US Coast
Guard; note - Coast Guard administered in peacetime by the
Department of Homeland Security, but in wartime reports to the
Department of the Navy (2008)