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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, WI8,944,789
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, MI4,326,040
Atlanta-Gainesville .Atlanta, GA; Gainesville, GA4,196,670
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, PR3,591,491
Phoenix-Mesa-Avondale Phoenix-Mesa, AZ; Avondale, AZ3,328,183
San Diego-Mission Viejo San Diego, CA; Mission Viejo, CA 3,273,255
Seattle-Bremerton-Marysville Seattle, WA; Bremerton, WA; Marysville, WA3,206,057
Cleveland-Akron-Canton-Lorain-Elyria Cleveland, OH; Akron, OH; Canton, OH; Lorain-Elyria, OH2,722,194
Tampa-St. Petersburg-Lakeland-Winter Haven Tampa-St. Petersburg, FL; Lakeland, FL; Winter Haven, FL; Brooksville, FL2,719,812
Cincinnati-Dayton-Middletown Cincinnati, OH-KY-IN; Dayton, OH; Middletown, OH; Springfield, OH2,426,070
Denver-Boulder-Longmont Denver-Aurora, CO; Boulder, CO; Longmont, CO; Lafayette-Louisville, CO2,339,587
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, FL1,814,061
Pittsburgh-Uniontown-Monessen Pittsburgh, PA; Uniontown-Connellsville, PA; Monessen, PA1,792,892
Kansas City-Lee’s Summit Kansas City, MO-KS; Lee’s Summit, MO1,468,106
Salt Lake City-Ogden-LaytonSalt Lake City, UT; Ogden-Layton, UT1,439,004
Indianapolis-Anderson Indianapolis, IN; Anderson, IN1,367,392
Charlotte-Gastonia-Concord Charlotte, NC-SC; Gastonia, NC; Concord, NC; Rock Hill, SC1,282,839
Nashville-MurfreesboroNashville-Davidson, TN; Murfreesboro, TN983,180
Raleigh-Durham Raleigh, NC; Durham, NC974,582
Palm Bay-Melbourne-Titusville-Vero Beach Palm Bay-Melbourne, FL; Titusville, FL; Vero Beach-Sebastian, FL; Port St. Lucie, FL938,675
Oklahoma City-Norman Oklahoma City, OK; Norman, OK875,469
Honolulu-Kailua (Honolulu County) Honolulu, HI; Kailua (Honolulu County), HI854,430
McAllen-Harlingen McAllen, TX; Harlingen, TX753,816
Greensboro-High Point-Winston-Salem Greensboro, NC; High Point, NC; Winston-Salem, NC741,457
Sarasota-Bradenton-Punta Gorda Sarasota-Bradenton, FL; North Port-Punta Gorda, FL726,695
Bonita Springs-Naples-Cape Coral Bonita Springs-Naples, FL; Cape Coral, FL659,480
Harrisburg-York-Lebanon Harrisburg, PA; York, PA; Lebanon, PA651,160
Greenville-Spartanburg, SC; Spartanburg, SC; Mauldin-Simpsonville, SC568,737
Pensacola-Fort Walton Beach Pensacola, FL-AL; Fort Walton Beach, FL506,715
Stockton-Lodi-Manteca Stockton, CA; Lodi, CA; Manteca, CA501,544
Spokane-Coeur d’Alene Spokane, WA-ID; Coeur d’Alene, ID441,042
Boise City-Nampa Boise City, ID; Nampa, ID422,639
Modesto-Turlock .Modesto, CA; Turlock, CA414,571
South Bend-Elkhart South Bend, IN-MI; Elkhart, IN-MI408,373
Salinas-Santa Cruz-Watsonville Salinas, CA; Santa Cruz, CA; Watsonville, CA388,071
Charleston-Huntington Charleston, WV; Huntington, WV-KY-OH354,568
Santa Rosa-Petaluma Santa Rosa, CA; Petaluma, CA351,752
Rockford-Beloit Rockford, IL; Beloit, WI-IL337,215
Atlantic City-Wildwood Atlantic City, NJ; Wildwood-North Wildwood-Cape May, NJ280,698
Appleton-Oshkosh Appleton, WI; Oshkosh, WI263,213
Beaumont-Port Arthur Beaumont, TX; Port Arthur, TX249,716
Macon-Warner Robins Macon, GA; Warner Robins, GA232,780
Kingsport-Johnson City Kingsport, TN–VA; Johnson City, TN208,241
Fairfield-Vacaville Fairfield, CA; Vacaville, CA 207,859

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