Contiguous United States

The contiguous United States is the 48 adjoining U.S. states plus Washington, D.C. (federal district) on the continent of North America that are south of Canada and north of Mexico. The term excludes the non-contiguous states of Alaska and Hawaii and all off-shore United States territories and possessions, which include American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands.

The greatest distance (on a great circle route) entirely within the 48 contiguous states is 2,802 miles (4,509 km, between Florida 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 3,119,884.69 square miles (8,080,464.3 km2), which is 1.58% of the total surface area of the Earth. Of this area, 2,959,064.44 square miles (7,663,941.7 km2) is land, composing 83.65% of U.S. land area, which is very similar to the area of Australia. Officially, 160,820.25 square miles (416,522.5 km2) is water area, composing 62.66% of the nation's water area.

The contiguous United States would be placed 5th in the list of countries and dependencies by area; the total area of the country, including Alaska and Hawaii, ranks fourth. Brazil is the only country that is larger than the contiguous United States, but smaller than the entire United States, while Russia, Canada, and China 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, if interpreted literally, would also include that state, so the term is sometimes qualified with the explicit inclusion or exclusion of Alaska to resolve any ambiguity. 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. However, even before Alaska became a state, it was sometimes included within the "Continental U.S."

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. 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" may or may not include the District of Columbia, which is not part of any of the 48 states. However, common usage is that it includes D.C. and simply means the contiguous U.S. as a region, since there is no typical need to politically separate D.C. from the region in everyday speech. "Lower 48" is also ambiguously misleading, since all the major islands of Hawaii are farther south than the most southern point of any other state, and thus, Hawaii could be considered "lower" than any other state.

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.

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 (and northernmost) 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 by the Canadian province of British Columbia. 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 was for many years, and still is, a common Alaskan equivalent for "contiguous United States".

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 Pacific Ocean, about 2,200 miles (3,500 km) from North America and almost halfway to Asia. In Hawaii and overseas American territories, for instance, the terms the Mainland or U.S. Mainland are often used to refer to the continental United States.

Non-contiguous areas within the contiguous United States



Some parts of the contiguous United States are accessible by road only by traveling on Canadian soil. Point Roberts, Washington; Elm Point, Minnesota; and the Northwest Angle in Minnesota are three such places. Alburgh, Vermont, is not directly connected by land, but is accessible by road via bridges from New York and Vermont.

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 not to be confused with the state of Washington.



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