y form of telephone
traffic; a rapidly growing cellular system carries mobile telephone
traffic throughout the country
international: 24 ocean cable systems in use; 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: AM about 5,000, FM about 5,000, shortwave 18
(1998)

Radios: 575 million (1997)

Television broadcast stations: more than 1,500 (including nearly 1,000
stations affiliated with the five major networks - NBC, ABC, CBS, FOX,
and PBS; in addition, there are about 9,000 cable TV systems) (1997)

Televisions: 219 million (1997)

Internet Service Providers (ISPs): 7,600 (1999 est.)

@United States:Transportation

Railways:
total: 240,000 km mainline routes (nongovernment owned)
standard gauge: 240,000 km 1.435-m gauge (1989)

Highways:
total: 6,348,227 km
paved: 3,732,757 km (including 88,727 km of expressways)
unpaved: 2,615,470 km (1997 est.)

Waterways: 41,009 km of navigable inland channels, exclusive of the
Great Lakes

Pipelines: petroleum products 276,000 km; natural gas 331,000 km
(1991)

Ports and harbors: Anchorage, Baltimore, Boston, Charleston, Chicago,
Duluth, Hampton Roads, Honolulu, Houston, Jacksonville, Los Angeles,
New Orleans, New York, Philadelphia, Port Canaveral, Portland
(Oregon), Prudhoe Bay, San Francisco, Savannah, Seattle, Tampa, Toledo

Merchant marine:
total: 386 ships (1,000 GRT or over) totaling 11,634,608
GRT/15,574,117 DWT
ships by type: barge carrier 10, bulk 67, cargo 28, chemical tanker
14, combination bulk 2, container 84, liquified gas 10,
multi-functional large load carrier 3, passenger 7, passenger/cargo 1,
petroleum tanker 104, roll-on/roll-off 43, short-sea passenger 3,
specialized tanker 1, vehicle carrier 9 (1999 est.)

Airports: 14,572 (1999 est.)

Airports - with paved runways:
total: 5,174
over 3,047 m: 180
2,438 to 3,047 m: 221
1,524 to 2,437 m: 1,310
914 to 1,523 m: 2,448
under 914 m: 1,015 (1999 est.)

Airports - with unpaved runways:
total: 9,398
over 3,047 m: 2
2,438 to 3,047 m: 6
1,524 to 2,437 m: 155
914 to 1,523 m: 1,661
under 914 m: 7,574 (1999 est.)

Heliports: 118 (1999 est.)

@United States:Military

Military branches: Department of the Army, Department of the Navy
(includes Marine Corps), Department of the Air Force
note: the Coast Guard is normally subordinate to