, 8.2770 (2003)

Communications
United States

Telephones - main lines in use:

163.2 million (2007)

Telephones - mobile cellular:

255 million (2007)

Telephone system:

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:

AM 4,789, FM 8,961, shortwave 19 (2006)

Radios:

575 million (1997)

Television broadcast stations:

2,218 (2006)

Televisions:

219 million (1997)

Internet country code:

.us

Internet hosts:

316 million (2008); note - the US Internet total host count includes
the following top level domain host addresses: .us, .com, .edu,
.gov, .mil, .net, and .org

Internet Service Providers (ISPs):

7,000 (2002 est.)

Internet users:

223 million (2008)

Transportation
United States

Airports:

14,947 (2007)

Airports - with paved runways:

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:

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:

146 (2007)

Pipelines:

petroleum products 244,620 km; natural gas 548,665 km (2006)

Railways:

total: 226,612 km
standard gauge: 226,612 km 1.435-m gauge (2005)

Roadways:

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 (Aust