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America's Urban Agglomerations
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 2010.
See Census 2010 urban area updates.
United States in Global Perspective
The United Nations reports global urban agglomergation data by country.
For 2009, Delhi, India at 36.5 million and Toyko, Japan at 21.7 million are reported as the largest.
The UN site reports the New York agglomeration at 19.3 million which is far below the 29.0 million shown in the table below.
At issue are the geographic boundaries for each area; there is no global standard definition for metros nor urban agglomeration areas.
Potential Agglomeration Areas & Census 2010
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 2010 Census data.
52 Potential Agglomeration Areas Table
A table presented below lists the potential agglomerations, the
component UAs, and the estimated population based on the 2006–2008
ACS 3-year estimates (3-year estimates were used because not all UAs
met the 65,000 person threshold for ACS 1-year estimates).
| 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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