sion 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 country code:
.us

Internet hosts:
115,311,958 (2002)

Internet Service Providers (ISPs):
7,000 (2002 est.)

Internet users:
159 million (2002)

Transportation United States

Railways:
total: 227,736 km
standard gauge: 227,736 km 1.435-m gauge (2003)

Highways:
total: 6,393,603 km
paved: 4,180,053 km (including 74,406 km of expressways)
unpaved: 2,213,550 km (2003)

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 (2004)

Pipelines:
petroleum products 244,620 km; natural gas 548,665 km (2003)

Ports and harbors:
Corpus Christi, Duluth, Hampton Roads, Houston, Long Beach, Los
Angeles, New Orleans, New York, Philadelphia, Tampa, Texas City
note: 13 ports north of New Orleans (South Louisiana Ports) on the
Mississippi River handle 290,000,000 tons of cargo annually.

Merchant marine:
total: 486 ships (1,000 GRT or over) 12,436,658 GRT/14,630,116 DWT
by type: barge carrier 7, bulk carrier 19, cargo 152, chemical
tanker 19, container 92, passenger 17, passenger/cargo 57, petroleum
tanker 79, refrigerated cargo 2, roll on/roll off 28, vehicle
carrier 14
foreign-owned: 49 (Australia 2, Canada 8, China 1, Denmark 20,
Malaysia 2, Netherlands 1, Norway 2, Singapore 11, Sweden 1, United
Kingdom 1)
registered in other countries: 680 (2005)

Airports:
14,857 (2004 est.)

Airports - with paved runways:
total: 5,128
over 3,047 m: 188
2,438 to 3,047 m: 221
1,524 to 2,437 m: 1,375
914 to 1,523 m: 2,383
under 914 m: 961 (2004 est.)

Airports - with unpaved runways:
total: 9,729
over 3,047 m: 1
2,438 to 3,047 m: 7
1,524 to 2,437 m: 160
914 to 1,523 m: 1,718
under 914 m: 7,843 (2004 est.)

Heliports:
155 (2004 est.)

Military United States

Military branches:
Army, Navy and Marine Corps, Air Force, and Coast Guard (Coast
Guard administered in peacetime by the Department of Homeland
Security, but in wartime reports to the Department of the Navy)

Military service age and obligation:
18 years of age (2004)

Manpower available for military ser