Megaregions of the United States

Population tables of U.S. cities
The skyline of New York City, the most populous city in the United States
Cities
Population Area Density Ethnic identity Foreign-born Income Spanish speakers capitals By decade By state By decade/state
Urban areas
Populous cities and metropolitan areas
Metropolitan areas
184 combined statistical areas 935 core-based statistical areas 393 metropolitan statistical areas 542 micropolitan statistical areas
Megaregions
See related population lists North American metro areas World cities States and territories
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The megaregions of the United States are eleven regions of the United States that contain two or more roughly adjacent urban metropolitan areas that, through commonality of systems, including transportation, economies, resources, and ecologies, experience blurred boundaries between the urban centers, perceive and act as if they are a continuous urban area.^[1]

Each respective region is also known as a "megalopolis", a term initially coined to define Northeastern United States, which ranges from Boston in the north to Washington, D.C. in the south. That region has an estimated population of over 50 million people as of 2022 and includes some of the nation's largest cities, including Baltimore, New York City, and Philadelphia.