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Megaregions of the United States

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Title: Megaregions of the United States  
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Subject: Great Lakes Megalopolis, Southern California, Texas Triangle, Front Range Urban Corridor, Arizona Sun Corridor
Collection: Megapolitan Areas of the United States, Urban Studies and Planning Terminology
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Megaregions of the United States

Megaregions of the United States are clustered networks of American cities, the population of which currently ranges or is projected to range from about 7 to 63 million by the year 2025.[1][2][3] Rockefeller and Ford Foundations, lists 11 megaregions in the United States and Canada.[1] Megapolitan areas were explored in a July 2005 report by Robert E. Lang and Dawn Dhavale of the Metropolitan Institute at Virginia Tech.[5] A later 2007 article by Lang and Nelson uses 20 megapolitan areas grouped into 10 megaregions.[6] The concept is based on the original megalopolis model.[3]


  • Definition 1
  • Planning 2
  • Identification 3
    • Shortcomings of this method 3.1
      • Canada 3.1.1
  • Outside the United States 4
  • Statistics 5
  • Major cities 6
    • Cities not included 6.1
  • See also 7
  • References 8
  • External links 9


A megaregion is a large network of metropolitan regions that share several or all of the following:
  • Environmental systems and topography
  • Infrastructure systems
  • Economic linkages
  • Settlement and land use patterns
  • Culture and history[7]

A megaregion may also be known as a [8]

The megaregion concept provides cities and metropolitan regions a context within which to cooperate across jurisdictional borders, including the coordination of policies, to address specific challenges experienced at the megaregion scale, such as planning for high-speed rail, protecting large watersheds, and coordinating regional economic development strategies.

The Regional Plan Association recognizes 11 emerging megaregions:[9]


Though identification of the megaregions has gone through several iterations, the 11 identified above are based on a set of criteria developed by Regional Plan Association, through its America 2050 initiative - a joint venture with the Lincoln Institute of Land Policy. Two historic publications helped lay the foundation for this new set of criteria, the book Megalopolis by Jean Gottmann (1961)[10] and The Regions’ Growth, part of Regional Plan Association’s second regional plan.

The relationships underpinning megaregions have become more pronounced over the second half of the 20th century as a result of decentralized land development, longer daily commutes, increased business travel, and a more footloose, flexible, knowledge workforce. The identification of new geographic scales—historically based on increased population movement from the city center to lower density areas—has a long history; but unlike those that came before, the megaregion concept does not simply recognize and accept the anticipated pattern of growth as inevitable; the megaregion presents immense opportunities from a regional planning perspective, to improve the environmental, infrastructure and other issues shared among the regions within it. Gottman explains, "As the work of data-gathering and analysis progressed it became evident that the key to most of the questions involved in this study of Megalopolis lies in the interrelationships between the forces and processes at work within the area rather than in the trends of growth or the development of techniques. Thus the trend of population increase, easy to measure and perhaps to forecast approximately, provides less insight into the nature of the area than do the interrelations existing between the processes that caused the local population to grow, those that attracted certain kinds of people to Megalopolis, and those that supplied the swelling crowds with the means to live and work there. Many of these processes are statistically measurable and some of them can be mapped, but the degree to which each of them stems from the others or determines them is a much more subtle matter, and is more basic to an understanding of what is going on and what can be done about it."[10] The most recent and only previous attempt to plan at this scale happened more than 70 years ago, with the Tennessee Valley Authority. Political issues stymied further efforts at river basin planning and development.[8]

In 1961's Megalopolis, Gottman describes the Northeastern seaboard of the United States - or Megapologis - as "... difficult to single out ... from surrounding areas, for its limits cut across established historical divisions, such as New England and the Middle Atlantic states, and across political entities, since it includes some states entirely and others only partially." On the complex nature of this regional scale, he writes:

Some of the major characteristics of Megalopolis, which set it apart as a special region within the United States, are the high degree of concentration of people, things and functions crowded here, and also their variety. This kind of crowding and its significance cannot be described by simple measurements. Its various aspects will be shown on a number of maps, and if these could all be superimposed on one base map there would be demarcated an area in which so many kinds of crowding coincide in general (though not always in all the details of their geographical distribution) that the region is quite different from all neighboring regions and in fact from any other part of North America. The essential reason for its difference is the greater concentration here of a greater variety of kinds of crowding. Crowding of population, which may first be expressed in terms of densities per square mile, will, of course, be a major characteristic to survey. As this study aims at understanding the meaning of population density, we shall have to know the foundation that supports such crowding over such a very fast area. What do these people do? What is their average income and their standard of living? What is the distribution pattern of wealth and of certain more highly paid occupations? For example, the outstanding concentration of population in the City of New York and its immediate suburbs (a mass of more than ten million people by any count) cannot be separated from the enormous concentration in the same city of banking, insurance, wholesale, entertainment, and transportation activities. These various kinds of concentration have attracted a whole series of other activities, such as management of large corporations, retail business, travel agencies, advertising, legal and technical counseling offices, colleges, research organizations, and so on. Coexistence of all these facilities on an unequaled scale within the relatively small territory of New York City, and especially of its business district...has made the place even more attractive to additional banking, insurance, and mass media organizations. Thus have concentration snowballed.[10]


The methodology for identifying the emerging megaregions included assigning each county a point for each of the following:

  • It was part of a core-based statistical area;
  • Its population density exceeded 200 people per square mile as of the 2000 census;
  • The projected population growth rate was expected to be greater than 15 percent and total increased population was expected to exceed 1,000 people by 2025;
  • The population density was expected to increase by 50 or more people per square mile between 2000 and 2025; and
  • The projected employment growth rate was expected to be greater than 15 percent and total growth in jobs was expected to exceed 20,000 by 2025.[11]

Shortcomings of this method

This methodology was much more successful at identifying fast-growing regions with existing metropolitan centers than more sparsely populated, slower growing regions. Nor does it include a distinct marker for connectedness between cities.[11]


While the report identifies megaregions that are shared between the US and Canada, and is presumably at least tangentially concerned with pan-North American issues, it does not clearly define their frontiers within Canada nor does it include Canadian population centres that are not adjacent to US megaregions. It includes Southern Ontario in the Great Lakes Megaregion but excludes the St. Lawrence Valley, despite the fact that Canadian geographers usually include them as part of one larger Quebec City-Windsor Corridor.

Outside the United States

The close relationship between large linked metropolitan regions and a nation's ability to compete in the global economy is recognized in Europe and Asia. Each has aggressively pursued strategies to manage projected population growth and strengthen economic prosperity in its large regions.

The European Spatial Development Perspective, a set of policies and strategies adopted by the European Union in 1999, is working to integrate the economies of the member regions, reduce economic disparities, and increase economic competitiveness (Faludi 2002; Deas and Lord 2006).

In East Asia, comprehensive strategic planning for large regions, centered on metropolitan areas, has become increasingly common and has progressed further than in the United States or Europe. Planning for the Hong Kong-Pearl River Delta region, for instance, aims to enhance the region's economic strength and competitiveness by overcoming local fragmentation, building on global economic cooperation, taking advantage of mutually beneficial economic factors, increasing connectivity among development nodes, and pursuing other strategic directions.[8]


Megalopolis Name Population
in millions
Percent of U.S. Population (2010) Population
in millions
2025 (projected)
percent growth 2010 - 2025 (projected)
Major cities
Arizona Sun Corridor[12][13] 5.6 2% 7.8 39.3% Mesa, Phoenix, Tucson, Prescott
Cascadia 8.4 3% 8.8 5.0% Abbotsford, Boise, Eugene, Portland (OR), Salem, Seattle, Tacoma, Spokane, Tri-Cities, Vancouver (BC), Vancouver (WA), Victoria
Florida 17.3 6% 21.5 24.3% Fort Lauderdale, Jacksonville, Miami, Orlando, St. Petersburg, Tampa
Front Range 5.5 2% 6.9 26% Albuquerque, Cheyenne, Colorado Springs, Denver, Pueblo, Rio Rancho, Santa Fe, Taos
Great Lakes 55.5 18% 60.7 9.4% Akron, Ann Arbor, Buffalo, Chicago, Cincinnati, Cleveland, Columbus, Dayton, Des Moines, Detroit, Duluth, Erie, Flint, Fort Wayne, Green Bay, Grand Rapids, Hamilton, Indianapolis, Kalamazoo, Kansas City, Lansing, London, Madison, Milwaukee, Minneapolis, Oshawa, Ottawa, Pittsburgh, Quad Cities, Rochester (NY), Rochester (MN), Rockford, Saginaw, St. Louis, Saint Paul, Toledo, Toronto, Windsor
Gulf Coast 13.4 4% 16.3 21.6% Baton Rouge, Corpus Christi, Houston, Mobile, Gulfport, Biloxi, New Orleans, Pensacola
Northeast 52.3 17% 58.4 11.7% Allentown-Bethlehem, Atlantic City, Baltimore, Boston, Harrisburg, Nashua, Newark, New York, Norfolk, Ocean City, Philadelphia, Portland (ME), Providence, Richmond, Knowledge Corridor (Springfield and Hartford), Trenton, Virginia Beach, Washington, Wilmington, Worcester
Northern California 14 5% 16.4 17.1% Fresno, Modesto, Oakland, Reno, Sacramento, San Francisco, San Jose, Stockton
Piedmont Atlantic 17.6 6% 21.7 23.3% Atlanta, Birmingham, Charlotte, Greensboro, Greenville, Huntsville, Knoxville, Memphis, Montgomery, Nashville, Raleigh, Winston-Salem
Southern California 24.4 8% 29 18.9% Anaheim, Bakersfield, Las Vegas, Long Beach, Los Angeles, Riverside, San Bernardino, San Diego, Tijuana
Texas Triangle 19.7 6% 24.8 25.9% Austin, Dallas, Fort Worth, Houston, San Antonio

Please note that Houston appears twice (as part of Gulf Coast and Texas Triangle).

Major cities

Megaregion Major cities Related articles
Arizona Sun Corridor[14][15] Phoenix, Tucson, Prescott Arizona Sun Corridor, Arizona, Phoenix metropolitan area, Sun Belt
Cascadia Seattle, Vancouver (Canada), Portland, Bellingham, Victoria (Canada), Everett, Tacoma, Tri-Cities, Vancouver (Washington), Boise, Spokane, Eugene, Abbotsford (Canada) Pacific Northwest, Cascadia, Ecotopia
Florida Miami, Tampa, Orlando, Jacksonville, St Petersburg, Fort Lauderdale, West Palm Beach Florida, South Florida metropolitan area, Tampa Bay Area, Central Florida, Southwest Florida, Northeast Florida, Jacksonville metropolitan area, Sun Belt
Front Range Denver, Salt Lake City, Albuquerque, Colorado Springs, Provo, Cheyenne Front Range Urban Corridor, Wasatch Front
Great Lakes Chicago, Toronto (Canada), Detroit, Grand Rapids, Montreal (Canada), Minneapolis–Saint Paul, St. Louis, Pittsburgh, Erie, Cincinnati, Cleveland, Akron, Quad Cities, Ottawa (Canada), Kansas City, Columbus, Indianapolis, Milwaukee, Madison, Fort Wayne, Louisville, Buffalo, Rochester, Green Bay, Rochester, Duluth, Toledo Great Lakes Megalopolis, Great Lakes region, Midwestern United States, Quebec City – Windsor Corridor
Gulf Coast Houston, New Orleans, Baton Rouge, Mobile, Corpus Christi, Pensacola, Gulfport, McAllen, Brownsville, Lake Charles Gulf Coast, Sun Belt
Northeast New York City, Philadelphia, Wilmington, Atlantic City, Washington, D.C., Boston, Baltimore, Newark, Virginia Beach, Norfolk, Providence, Richmond, New Haven, Hartford, Springfield Northeast megalopolis, Northeast Corridor, Northeast, Mid-Atlantic
Northern California San Francisco, Oakland, San Jose, Sacramento, Fresno, Reno Northern California, California megapolitan areas, Sun Belt
Piedmont Atlantic Atlanta, Charlotte, Nashville, Greenville, Memphis, Raleigh, Birmingham, Greensboro, Spartanburg, Winston-Salem, Chattanooga, Durham, Huntsville, Knoxville, Montgomery, Piedmont Atlantic Megaregion, Piedmont, New South, South Atlantic States, I-85 Corridor, Piedmont Crescent, Sun Belt
Southern California Los Angeles, Anaheim, Santa Ana, Irvine, San Bernardino, Riverside, San Diego, Tijuana, Las Vegas Southern California, California megapolitan areas, Sun Belt
Texas Triangle Dallas, Houston, Fort Worth, Arlington, San Antonio, Austin, Oklahoma City, Tulsa Texas Triangle, TTC-35, International Mid-Continent Trade Corridor, I-35 Corridor, Sun Belt

Source: Regional Plan Association[1][16]

Cities not included

Thirteen of the top 100 primary census statistical areas are not included in any of the 11 emerging megaregions.[17]

Southwest El Paso, TX MSA (see also El Paso-Juárez)
Hawaii Honolulu, HI MSA
Mississippi Valley Des Moines-Newton-Pella, IA CSA, Omaha-Council Bluffs-Fremont, NE-IA CSA, Little Rock-North Little Rock-Pine Bluff, AR CSA, Jackson-Yazoo City, MS CSA, Wichita-Winfield, KS CSA
Ohio Valley Lexington-Fayette-Frankfort-Richmond, KY CSA
South Atlantic Coast Charleston-North Charleston-Summerville, SC MSA, Augusta-Richmond County, GA-SC MSA, Columbia, SC
Upstate New York Syracuse-Auburn, NY CSA, Albany-Schenectady-Amsterdam, NY CSA

See also


  1. ^ a b c "Megaregions". Retrieved October 1, 2014. 
  2. ^ "Who's Your City?: What Is a Megaregion?". March 19, 2008. Retrieved October 1, 2014. 
  3. ^ a b Cities: Capital for the New Megalopolis.Time magazine, November 4, 1966. Retrieved on July 19, 2010.
  4. ^ "About Us - America 2050". Retrieved October 1, 2014. 
  5. ^ "Beyond Megalopolis" by the Metropolitan Institute at Virginia Tech
  6. ^ The Rise of the Megapolitans (January 2007) by Robert E. Lang and Arthur C. Nelson. Retrieved on January 7, 2013.
  7. ^ a b Regional Plan Association (2006). America 2050: A Prospectus. New York, NY: Regional Plan Association.
  8. ^ a b c Dewar, Margaret and David Epstein (2006). "Planning for 'Megaregions' in the United States." Ann Arbor, MI: Urban and Regional Planning Program, University of Michigan.
  9. ^ Hagler, Yoav (2009). "Defining U.S. Megaregions." New York, NY: Regional Plan Association.
  10. ^ a b c Gottman, Jean (1961). Megalopolis: The Urbanized Northeastern Seaboard of the United States. New York: Twentieth Century Fund.
  11. ^ a b Hagler, Yoav (2009). "Defining U.S. Megaregions." New York, NY: Regional Plan Association.
  12. ^ "Megapolitan: Arizona's Sun Corridor".  
  13. ^ "When Phoenix, Tucson Merge".  
  14. ^ "Megapolitan: Arizona's Sun Corridor".  
  15. ^ "When Phoenix, Tucson Merge".  
  16. ^ Regional Plan Association (2008). America 2050: An Infrastructure Vision for 21st Century America. New York, NY: Regional Plan Association.
  17. ^ "Our Maps". Retrieved October 1, 2014. 

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