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America's Urban Agglomerations
December 2022. Urban agglomerations are contiguous areas of continuously developed urban territories.
Urban agglomeration data have typically not been reported by the Census Bureau,
the rationale being that they become progressively meaningless the larger the urban agglomeration area becomes.
It remains that urban agglomerations are of interest. New information surfaces as the Census
Bureau revises definitions relating to the urban geography for Census 2020
(results being finalized in 2023).
United States in Global Perspective
The United Nations reports global urban agglomeration data
by country (a downloadable xls file within this page and as of 2018).
For 2035, Delhi, India at 43 million and Toyko, Japan at 36 million are projected to be the largest based on population.
They project New York to be the largest U.S. agglomeration at 21 million in 2035.
At issue are the geographic boundaries for each area; there is no global standard definition for metros nor
urban agglomeration areas. See
alternative notes on urban agglomeration.
Census Defines New "Megalopolis"
In December 2022, the Census Bureau developed
this story
featuring a Megalopolis extending from New Hampshire to Washington, DC area.
Examine the Megalopolis area by county and subcounty area using
VDA Web GIS as illustrated in the following graphic.
In the following view, 2020 CBSAs
are shown with bolded brown semi-transparent boundaries. The 103 component counties are shown with bold black boundaries
and orange fill pattern.
The Megalopolis attribute has been coded as a selectable attribute into the "County1" layer in the
MetroDynamics GIS project.
.. read details in web page for description/meaning of legend.
.. click graphic for larger view with metro and county names.
Potential Agglomeration Areas
Based on Census 2000 Urbanized Areas (UAs), the
Census Bureau has identified 52 potential agglomerations consisting of
multiple and currently separate UAs. These agglomerations contain UAs that
currently are contiguous as well as some that are in close proximity to each other
and that potentially could form a continuous agglomeration when areas
are redefined based on 2020 Census data.
Agglomeration Areas
A table presented below lists the potential agglomerations, the
component UAs, and the American Community Survey estimated population for the 2010 Urbanized Areas.
| New York-Philadelphia-Connecticut |
New York-Newark, NY-NJ-CT; Philadelphia, PA-NJ-DE-MD; Allentown-Bethlehem, PA-NJ; Lancaster, PA; Pottstown, PA; Reading, PA; Trenton, NJ; Hightstown, NJ; Vineland, NJ; Poughkeepsie-Newburgh, NY; Bridgeport-Stamford, CT; Danbury, CT-NY; Hartford, CT; New Haven, CT; Norwich-New London, CT; Waterbury, CT; Springfield, MA-CT |
29,028,337 |
| |
| Los Angeles-Riverside-San Bernardino |
Los Angeles-Long Beach-Santa Ana, CA; Riverside-San Bernardino, CA; Camarillo, CA; Hemet, CA; Oxnard, CA; Santa Barbara, CA; Santa Clarita, CA; Simi Valley, CA; Temecula-Murrieta, CA; Thousand Oaks, CA |
15,492,749 |
| |
| Chicago-Kenosha-Racine-Round Lake Beach |
Chicago, IL-IN; Kenosha, WI; Round Lake Beach-McHenry-Grayslake, ILWI; Racine, WI | 8,944,789 |
| |
| Boston-Providence-Worcester |
Boston, MA; Providence, RI-MA; Worcester, MA-CT; Barnstable Town, MA; Leominster-Fitchburg, MA; New Bedford, MA; Dover-Rochester, NH; Manchester, NH; Nashua, NH; Portsmouth, NH |
6,692,295 |
| |
| Baltimore-Washington |
Aberdeen, MD; Baltimore, MD; Washington, DC-VA-MD; St. Charles, MD |
6,585,315 |
| |
| San Francisco-Oakland-San Jose |
San Francisco-Oakland, CA; San Jose, CA; Antioch, CA; Concord, CA; Livermore, CA; Vallejo, CA |
5,870,212 |
| |
| Dallas-Fort Worth | Dallas-Fort Worth-Arlington, TX; Denton-Lewisville, TX; McKinney, TX | 5,006,527 |
| |
| Houston-Texas City | Houston, TX; Texas City, TX; Galveston, TX; The Woodlands, TX | 4,599,176 |
| |
| Detroit-Ann Arbor-Port Huron | Detroit, MI; Ann Arbor, MI; Port Huron, MI; South Lyon-Howell-Brighton, MI | 4,326,040 |
| |
| Atlanta-Gainesville . | Atlanta, GA; Gainesville, GA | 4,196,670 |
| |
| San Juan-Aguadilla-Ponce | San Juan, PR; Aguadilla-Isabela-San Sebastia´n, PR; Arecibo, PR; Fajardo, PR; Florida-Barceloneta-Bajadero, PR; Guayama, PR; Juana Di´az, PR; Mayagu¨ez, PR; Ponce, PR; San Germa´n-Cabo Rojo-Sabana Grande, PR; Yauco, PR | 3,591,491 |
| |
| Phoenix-Mesa-Avondale | Phoenix-Mesa, AZ; Avondale, AZ | 3,328,183 |
| |
| San Diego-Mission Viejo | San Diego, CA; Mission Viejo, CA | 3,273,255 |
| |
| Seattle-Bremerton-Marysville | Seattle, WA; Bremerton, WA; Marysville, WA | 3,206,057 |
| |
| Cleveland-Akron-Canton-Lorain-Elyria | Cleveland, OH; Akron, OH; Canton, OH; Lorain-Elyria, OH | 2,722,194 |
| |
| Tampa-St. Petersburg-Lakeland-Winter Haven | Tampa-St. Petersburg, FL; Lakeland, FL; Winter Haven, FL; Brooksville,
FL | 2,719,812 |
| |
| |
| Cincinnati-Dayton-Middletown | Cincinnati, OH-KY-IN; Dayton, OH; Middletown, OH; Springfield, OH | 2,426,070 |
| |
| Denver-Boulder-Longmont | Denver-Aurora, CO; Boulder, CO; Longmont, CO; Lafayette-Louisville, CO | 2,339,587 |
| |
| St. Louis-Alton | St. Louis, MO-IL; Alton, IL | 2,184,037 |
| |
| Orlando-Ocala-Kissimmee | Orlando, FL; Ocala, FL; Kissimmee, FL; Lady Lake, FL; Leesburg-Eustis,
FL | 1,814,061 |
| |
| Pittsburgh-Uniontown-Monessen | Pittsburgh, PA; Uniontown-Connellsville, PA; Monessen, PA | 1,792,892 |
| |
| Kansas City-Lee’s Summit | Kansas City, MO-KS; Lee’s Summit, MO | 1,468,106 |
| |
| Salt Lake City-Ogden-Layton | Salt Lake City, UT; Ogden-Layton, UT | 1,439,004 |
| |
| Indianapolis-Anderson | Indianapolis, IN; Anderson, IN | 1,367,392 |
| |
| Charlotte-Gastonia-Concord | Charlotte, NC-SC; Gastonia, NC; Concord, NC; Rock Hill, SC | 1,282,839 |
| |
| Nashville-Murfreesboro | Nashville-Davidson, TN; Murfreesboro, TN | 983,180 |
| |
| Raleigh-Durham | Raleigh, NC; Durham, NC | 974,582 |
| |
| Palm Bay-Melbourne-Titusville-Vero Beach | Palm Bay-Melbourne, FL; Titusville, FL; Vero Beach-Sebastian, FL; Port
St. Lucie, FL | 938,675 |
| |
| Oklahoma City-Norman | Oklahoma City, OK; Norman, OK | 875,469 |
| |
| |
| |
| Honolulu-Kailua (Honolulu County) | Honolulu, HI; Kailua (Honolulu County), HI | 854,430 |
| |
| McAllen-Harlingen | McAllen, TX; Harlingen, TX | 753,816 |
| |
| Greensboro-High Point-Winston-Salem | Greensboro, NC; High Point, NC; Winston-Salem, NC | 741,457 |
| |
| Sarasota-Bradenton-Punta Gorda | Sarasota-Bradenton, FL; North Port-Punta Gorda, FL | 726,695 |
| |
| Bonita Springs-Naples-Cape Coral | Bonita Springs-Naples, FL; Cape Coral, FL | 659,480 |
| |
| Harrisburg-York-Lebanon | Harrisburg, PA; York, PA; Lebanon, PA | 651,160 |
| |
| Greenville-Spartanburg | , SC; Spartanburg, SC; Mauldin-Simpsonville, SC | 568,737 |
| |
| Pensacola-Fort Walton Beach | Pensacola, FL-AL; Fort Walton Beach, FL | 506,715 |
| |
| Stockton-Lodi-Manteca | Stockton, CA; Lodi, CA; Manteca, CA | 501,544 |
| |
| Spokane-Coeur d’Alene | Spokane, WA-ID; Coeur d’Alene, ID | 441,042 |
| |
| Boise City-Nampa | Boise City, ID; Nampa, ID | 422,639 |
| |
| Modesto-Turlock . | Modesto, CA; Turlock, CA | 414,571 |
| |
| South Bend-Elkhart | South Bend, IN-MI; Elkhart, IN-MI | 408,373 |
| |
| Salinas-Santa Cruz-Watsonville | Salinas, CA; Santa Cruz, CA; Watsonville, CA | 388,071 |
| |
| Charleston-Huntington | Charleston, WV; Huntington, WV-KY-OH | 354,568 |
| |
| Santa Rosa-Petaluma | Santa Rosa, CA; Petaluma, CA | 351,752 |
| |
| Rockford-Beloit | Rockford, IL; Beloit, WI-IL | 337,215 |
| |
| Atlantic City-Wildwood | Atlantic City, NJ; Wildwood-North Wildwood-Cape May, NJ | 280,698 |
| |
| Appleton-Oshkosh | Appleton, WI; Oshkosh, WI | 263,213 |
| |
| Beaumont-Port Arthur | Beaumont, TX; Port Arthur, TX | 249,716 |
| |
| Macon-Warner Robins | Macon, GA; Warner Robins, GA | 232,780 |
| |
| Kingsport-Johnson City | Kingsport, TN–VA; Johnson City, TN | 208,241 |
| |
| Fairfield-Vacaville | Fairfield, CA; Vacaville, CA | 207,859 |
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