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United States:
Communications & Transportation

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Geography, People, Government, Economy, Military & Transnational Issues.
Telephones - main lines in use
Definition - World rank and map
172 million (2006)
Telephones - main lines in use per 1,000 people
Definition - World rank and map
566.1 (2006)
Telephones - mobile cellular
Definition - World rank and map
255 million (2007)
Telephones - mobile cellular subscribers per 1,000 people
Definition - World rank and map
839.3 (2007)
Telephone system
Definition
general assessment: a large, technologically advanced, multipurpose communications system
domestic: a large system of fiber-optic cable, microwave radio relay, coaxial cable, and domestic satellites carries every form of telephone traffic; a rapidly growing cellular system carries mobile telephone traffic throughout the country
international: country code - 1; multiple ocean cable systems provide international connectivity; satellite earth stations - 61 Intelsat (45 Atlantic Ocean and 16 Pacific Ocean), 5 Intersputnik (Atlantic Ocean region), and 4 Inmarsat (Pacific and Atlantic Ocean regions) (2000)
Radio broadcast stations
Definition
AM 4,789, FM 8,961, shortwave 19 (2006)
Television broadcast stations
Definition
2,218 (2006)
Internet country code
Definition
.us
Internet hosts
Definition - World rank and map
282 million (2007); note - the US Internet total host count includes the following top level domain host addresses: .us, .com, .edu, .gov, .mil, .net, and .org
Internet hosts per 1,000 people
Definition - World rank and map
928.2 (2007)
Internet users
Definition - World rank and map
223 million (2008)
Internet users per 1,000 people
Definition - World rank and map
734 (2008)
Airports
Definition - World rank and map
14,947 (2007)
Airports - with paved runways
Definition
total: 5,143
over 3,047 m: 191
2,438 to 3,047 m: 224
1,524 to 2,437 m: 1,452
914 to 1,523 m: 2,323
under 914 m: 953 (2007)
Airports - with unpaved runways
Definition
total: 9,804
2,438 to 3,047 m: 7
1,524 to 2,437 m: 153
914 to 1,523 m: 1,732
under 914 m: 7,912 (2007)
Heliports
Definition
146 (2007)
Pipelines
Definition
petroleum products 244,620 km; natural gas 548,665 km (2006)
Railways
Definition - World rank and map
total: 226,612 km
standard gauge: 226,612 km 1.435-m gauge (2005)
Roadways
Definition - World rank and map
total: 6,430,366 km
paved: 4,165,110 km (includes 75,009 km of expressways)
unpaved: 2,265,256 km (2005)
Waterways
Definition
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
Definition - World rank and map
total: 442 ships (1000 GRT or over) 10,486,942 GRT/12,537,108 DWT
by type: barge carrier 6, bulk carrier 61, cargo 83, carrier 2, chemical tanker 22, container 81, passenger 20, passenger/cargo 61, petroleum tanker 56, refrigerated cargo 3, roll on/roll off 25, vehicle carrier 22
foreign-owned: 69 (Australia 2, Denmark 31, Germany 5, Malaysia 3, Netherlands 1, Norway 9, Singapore 12, Sweden 5, UK 1)
registered in other countries: 725 (Antigua and Barbuda 8, Australia 2, Bahamas 108, Belize 1, Bermuda 23, Cambodia 6, Canada 10, Cayman Islands 42, Comoros 2, Cyprus 6, Ecuador 1, Greece 8, Honduras 1, Hong Kong 29, Ireland 2, Isle of Man 4, Italy 17, Liberia 105, Luxembourg 4, Malta 14, Marshall Islands 120, Netherlands 13, Netherlands Antilles 1, Norway 8, Panama 123, Puerto Rico 3, Russia 1, Singapore 18, South Korea 7, St Vincent and the Grenadines 19, Trinidad and Tobago 1, Tuvalu 1, UK 13, Vanuatu 1, unknown 3) (2008)
Ports and terminals
Definition
Corpus Christi, Duluth, Hampton Roads, Houston, Long Beach, Los Angeles, New York, Philadelphia, Tampa, Texas City


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