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The contiguous United States or officially the conterminous United States consists of the 48 adjoining U.S. states (plus Washington, D.C.) on the of . The terms exclude the non-contiguous states of and , and all off-shore ,

(1991). 9780679401100, Random House.
These maps show the contiguous 48 states and D.C., but not Alaska and Hawaii.
  • These differ from the related term continental United States which includes Alaska (also on the North American continent but separated from the 48 states by , Canada) but excludes Hawaii and insular territories.

The greatest distance (on a route) entirely within the 48 contiguous states is 2,802 miles (4,509 km, between and the State of Washington); the greatest north-south line is 1,650 miles (2,660 km).

Together, the 48 contiguous states and Washington, D.C. occupy a combined area of . Of this area, is contiguous land, composing 83.65% of total U.S. land area, similar to the area of . Officially, of the contiguous United States is water area, composing 62.66% of the nation's total water area.

The contiguous United States would be placed 5th in the list of sovereign states and dependencies by area; the total area of the country, including Alaska and Hawaii, ranks fourth. is the only country that is larger in total area than the contiguous United States, but smaller than the entire United States, while , and are the only three countries larger than both. The 2010 census population of this area was 306,675,006, comprising 99.33% of the nation's population, and a density of 103.639 inhabitants/sq mi (40.015/km2), compared to 87.264/sq mi (33.692/km2) for the nation as a whole.


Other terms
While conterminous U.S. has the precise meaning of contiguous U.S. (both adjectives meaning "sharing a common boundary"), other terms commonly used to describe the 48 contiguous states have a greater degree of ambiguity.


Continental United States
Because Alaska is also on the North American continent, the term continental United States would also include that state, so the term is sometimes qualified with the explicit inclusion or exclusion of Alaska to resolve any ambiguity.*
  • (before statehood)
(2018). 9780808015963 .
  • "... outside the continental United States (includes Alaska and Hawaii, as well as Canada and all foreign countries)...
The term was in use prior to the admission of Alaska and Hawaii as states of the United States and at that time usually excluded outlying territories of the United States. "... merchandise to foreign countries from continental United states, Puerto Rico, and the territories of Alaska and Hawaii." United States Foreign Trade (1950-1953) However, even before Alaska became a state, it was sometimes included within the "Continental U.S.""In the absence of any such statement, Alaska probably would be regarded as a part of the continental United States." Inland Marine and Transportation Insurance (1949)


CONUS and OCONUS
CONUS, a technical term used by the U.S. Department of Defense, General Services Administration, NOAA/National Weather Service, and others, has been defined both as the continental United States, and as the 48 contiguous states. "CONUS" seems to be used primarily by the American military and the Federal government and those doing business with them. The District of Columbia is not always specifically mentioned as being part of CONUS.

OCONUS is derived from CONUS with O for outside added, thus referring to Outside of Continental United States (OCONUS).


The lower 48
The term lower 48 is also used to refer to the conterminous United States. The National Geographic style guide recommends the use of contiguous or conterminous United States instead of lower 48 when the 48 states are meant, unless used in the context of Alaska.


Zone of the Interior
During World War II, the first four numbered Air Forces of the were said to be assigned to the Zone of the Interior by the American military organizations of the timeā€”the future states of and , then each only territories of the Union, were respectively covered by the Eleventh Air Force and Seventh Air Force during WW II.


Terms used in the non-contiguous states
Both Alaskans and Hawaiians have unique labels for the contiguous United States because of their own locations relative to them.


Alaska
Alaska became the 49th state of the United States on January 3, 1959. Alaska is on the northwest end of the North American continent, but separated from the rest of the United States Pacific coast by the Canadian province of . In Alaska, given the ambiguity surrounding the usage of continental, the term "continental United States" is almost unheard of when referring to the contiguous 48 states. Several other terms have been used over the years. The term Lower 48 has, for many years, been a common Alaskan equivalent for "contiguous United States"; today, more Alaskans use the term "Outside", though a few persons may use "Outside" to refer to any location not within Alaska. Speaking Alaskan: Words Alaskans Say


Hawaii
Hawaii became the 50th state of the United States on August 21, 1959. It is the southernmost and so far, the latest state to join the Union. Not part of any continent, Hawaii is located in the , about from North America and almost halfway to . In Hawaii and , for instance, the terms the Mainland or U.S. Mainland are often used to refer to the contiguous United States.Edles, Laura Desfor (2003). "'Race,' 'Ethnicity,' and 'Culture' in Hawai'i: The Myth of the 'Model Minority' State". In Loretta I. Winters and Herman L. DeBose (ed.) New Faces in a Changing America: Multiracial Identity in the 21st Century. SAGE Publications. p. 241. .


Non-contiguous areas within the contiguous United States
Apart from off-shore US islands, a few continental portions of the contiguous US are accessible by road only by traveling through Canada. Point Roberts, Washington; Elm Point, Minnesota; and the in are three such places. Alburgh, Vermont, is not directly connected by land, but is accessible by road via bridges from within Vermont and from New York.


List of contiguous U.S. states
The 48 contiguous United States are:

Washington, D.C. (the U.S. capital, also referred to as the District of Columbia) is distinct from the state of Washington.


See also
  • Extreme points of the United States


Notes

External links

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