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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, 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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