Lower 48

Lower 48
Name	Lower 48
Other name	Continental United States (contiguous United States) — forbidden
Settlement type	Informal region
Subdivision type	Country
Subdivision name	United States
Area total km2	7686850
Population est	331893745
Population as of	2020 census

Lower 48 is a colloquial term used to describe the contiguous states of the United States excluding the states of Alaska and Hawaii. The phrase has practical use in navigation, logistics, law, and culture, appearing in contexts ranging from United States Postal Service routing to reports by the United States Census Bureau and commentary in media outlets such as The New York Times, The Washington Post, and National Public Radio. It contrasts administratively and geographically with the noncontiguous states and with associated territories like Puerto Rico and the United States Virgin Islands.

Etymology and usage

The label emerged in the 19th and 20th centuries as the nation expanded westward and later when Alaska and Hawaii were incorporated as states. Early usage appears alongside terms used in correspondence among officials in the United States Navy, the United States Army, and the United States Postal Service to distinguish shipments and personnel movements involving Alaska, Hawaii, and the continental chain. The phrase gained broader visibility in reporting by newspapers such as the Chicago Tribune and the Los Angeles Times, and in broadcast journalism from networks including CBS News and ABC News. Contemporary technical usage can be found in publications by agencies like the National Oceanic and Atmospheric Administration and the Federal Aviation Administration.

Geography and boundaries

The area commonly indicated comprises the 48 states that form an unbroken landmass on the North American continent: from the Maine coastline on the Atlantic to the California and Oregon coasts on the Pacific, and from the Minnesota-North Dakota border region to the Texas and Florida southern boundaries. It includes major physiographic provinces such as the Appalachian Mountains, the Great Plains, the Rocky Mountains, and the Sierra Nevada. Major river systems within this area include the Mississippi River, the Missouri River, and the Colorado River. By contrast, the states of Alaska—with the Aleutian Islands—and Hawaii—an archipelago in the Central Pacific Ocean—lie outside this contiguous landmass and are treated separately in many cartographic and logistical frameworks.

Demographics and economy

The contiguous states encompass the vast majority of the United States population, including major metropolitan regions such as New York City, Los Angeles, Chicago, Houston, and Phoenix. Demographic trends reported by the United States Census Bureau show diverse patterns of migration and growth in metropolitan statistical areas including Dallas–Fort Worth, Miami, Atlanta, and Seattle. The contiguous states contain economic centers like Wall Street in New York City, the Silicon Valley cluster near San Jose, California, the Chicago Mercantile Exchange, and the Houston Ship Channel. Key industries represented across the region include finance concentrated in New York City, technology hubs around San Francisco and Seattle, manufacturing corridors in Detroit and Pittsburgh, and agricultural production in the Iowa-Nebraska-Kansas belt.

Transportation and infrastructure

Transportation networks across the contiguous states are anchored by national highways such as the Interstate Highway System, major rail corridors operated by companies like Union Pacific Railroad and BNSF Railway, and air hubs including Hartsfield–Jackson Atlanta International Airport, Los Angeles International Airport, and O'Hare International Airport. Inland waterways such as the Mississippi River support barge traffic tied to facilities like the Port of New Orleans and the Port of South Louisiana. Federal agencies including the Federal Highway Administration and the Federal Railroad Administration coordinate infrastructure planning, while regional authorities like the Metropolitan Transportation Authority (New York) and the Port Authority of New York and New Jersey manage dense urban systems.

Legal and political context

In law and politics the contiguous states are treated variously depending on statutory and constitutional frameworks. Federal statutes and administrative rules from agencies such as the Internal Revenue Service and the Social Security Administration often distinguish domicile or residency rules that have operational differences for Alaska and Hawaii versus the contiguous states. Electoral processes administered by state secretaries—examples include the New York State Board of Elections and the California Secretary of State—follow state-specific regulations but operate within the constitutional regime established by the United States Constitution and interpreted by the Supreme Court of the United States. Military basing and deployments overseen by commands such as United States Northern Command frequently reference distinctions among the contiguous states, Alaska, and Hawaii for readiness and logistics.

Cultural significance and media references

The contiguous states figure prominently in cultural narratives and media, from travel literature about the Pacific Coast Highway and the Great Lakes to music referencing routes like Route 66 and the blues traditions of New Orleans. Film and television industries concentrated in Hollywood and studios in Atlanta and Chicago produce works distributed by companies such as Warner Bros., Disney, and Netflix. Journalism by outlets including The Wall Street Journal, Los Angeles Times, and The Atlantic frequently frames stories with contrasts between life in the contiguous states and the experiences of residents in Alaska and Hawaii. The term also appears in sporting contexts when leagues like the National Football League and the National Basketball Association schedule events involving teams across the contiguous expanse.

Category:Regions of the United States