There are zero cities in the Northeast megalopolis.
Baltimore ( [ ˈbɔːltᵻˌmɔːr ] , locally : [ - allˈbɔɫ.mɔɻ ] ) is the largest city in the U.S. state of Maryland , and the 29th-most populous city in the country . Megalopolis . Later , it was used by Jean Gottmann in his landmark 1961 study , Megalopolis : The Urbanized Northeastern Seaboard of the United States , to describe the chain of metropolitan areas along the northeastern seaboard of the U.S. extending from Boston , Massachusetts , through New York City , Philadelphia , Baltimore , and ending in Washington , D.C. and Northern Virginia . The Northeast megalopolis ( also Boston -- Washington Corridor or Bos-Wash Corridor ) is the most heavily urbanized region of the United States , running primarily northeast to southwest from the northern suburbs of Boston , Massachusetts , to the southern suburbs of Washington , D.C. , in Northern Virginia . French geographer Jean Gottmann popularized the term in his landmark 1961 study of the region , Megalopolis : The Urbanized Northeastern Seaboard of the United States . United States . The capital is Washington , D.C. , and the largest city is New York City ; nine other major metropolitan areas -- each with at least 4.5 million inhabitants and the largest having more than 13 million people -- are Los Angeles , Chicago , Dallas , Houston , Philadelphia , Miami , Atlanta , Boston , and San Francisco .