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

The Census Bureau is considering applying a 1,000,000 person minimum population threshold to identify agglomerations to be split, but seeks comment on the appropriate population size threshold to determine which large agglomerations would be split. Other minimum population thresholds under consideration are 500,000 and 250,000. Based on 2006–2008 ACS estimates, 27 of the 52 potential agglomerations have populations less than 1,000,000; 14 have populations less than 500,000; and four have populations less than 250,000. If a threshold of 1,000,000 people is chosen as the minimum for splitting large agglomerations, all formerly separate UAs in agglomerations of less than 1,000,000 people would be merged to form a single UA. If 500,000 people is adopted as the minimum threshold, then all formerly separate UAs in agglomerations of less than that threshold would be merged. Because UAs form the cores of metropolitan statistical areas, the merger of formerly separate UAs might affect the delineation of metropolitan and micropolitan statistical areas. It is important to note that some of the agglomerations listed below are contained within the same metropolitan statistical area, and as a result, would not be split, regardless of the threshold chosen. The agglomerations are: Dallas- Fort Worth; Houston-Texas City; Phoenix-Mesa; San Diego-Mission Viejo; St. Louis-Alton; Pittsburgh-Uniontown-Monessen; Kansas City-Lee’s Summit; Charlotte-Gastonia-Concord; Nashville-Murfreesboro; Oklahoma City-Norman; Honolulu-Kailua; Stockton-Lodi-Manteca; Boise City-Nampa; Modesto- Turlock; Santa Rosa-Petaluma; Beaumont-Port Arthur; and Fairfield- Vacaville.

Differences Between Census 2000 Urban Area Criteria & Proposed Urban Area Criteria for the 2010 Census Criteria Census 2000 Criteria Proposed 2010 Census Criteria Analysis units for delineation of initial urban area cores Block groups of less than 2 square miles in area and population density of at least 1,000 persons per square mile Census tracts of less than 3 square miles in area and population density of at least 1,000 persons per square mile Jumps - maximum distance (measured along a road feature) 2.5 miles 1.5 miles Use of Land Use/Land Cover Data Nationwide land use/land cover data sets were not available. Use of National Land Cover Database (NLCD) to identify 1) territory with a high degree of impervious surface land cover as an indicator of non-residential urban land uses that should be considered for inclusion in an urban area; and 2) land cover that restricts development; e.g., marshes, wetlands, water. Qualification of airports (when adjacent to other qualifying territory) 10,000 or more enplanements (departing passengers) annually. 2,500 or more enplanements annually. Identification of central places Central places identified based on population size. Central places not identified. Minimum population residing outside institutional group quarters No requirement. As a result, 24 urban clusters were defined consisting entirely or predominantly of population residing in institutional group quarters. At least 1,500 persons must reside outside institutional group quarters for the area to qualify as an urban area. Splitting Large Agglomerations The agglomeration has at least 50,000 people in each of at least two different metropolitan statistical areas (MSAs) or primary metropolitan statistical areas (PMSAs), and the distance across the narrowest corridor of qualifying territory is less than 3 miles. The split will occur at a location near the MSA or PMSA boundary at which the width of the corridor is less than 3 miles. The agglomeration has at least 50,000 people in each of at least two different consolidated metropolitan statistical areas (CMSAs), and the distance across the narrowest corridor of qualifying territory is less than 3 miles. The split will occur at the CMSA boundary. The agglomeration encompasses at least 1,000,000 people. The split will occur at the metropolitan statistical area boundary (or metropolitan New England city and town area in New England). If an incorporated place or census designated place crosses the metropolitan statistical area boundary, the split occurs along the place boundary. The place is assigned to the resulting UA that contains the largest proportion of the place's land area.