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The United States Office of Management and Budget (OMB) defines micropolitan and metropolitan statistical areas. Metropolitan and micropolitan statistical areas consist of one or more counties (or county-equivalents). Currently defined metropolitan and micropolitan statistical areas are based on application of the 2000 standards (which appeared in the Federal Register on December 27 2000) to Census 2000 data, as updated by application of those standards to more recent Census Bureau population estimates. The current definition is as of December 2006.
If specified criteria are met, adjacent metropolitan and micropolitan statistical areas, in various combinations, may become the components of a new set of areas called 'combined statistical areas' (CSAs). Using Census Bureau data the OMB compiles lists of CSAs. The areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area. There are 126 CSAs defined by OMB as of December 2006.
Note that CSAs represent ''multiple'' metropolitan or micropolitan areas that have a high degree of employment interchange. CSAs often represent regions with common labor and media markets. The use of CSAs as a representation for a single metropolitan area is not always appropriate.

Contents

Largest CSAs

See also

External links

Largest CSAs

The following is a list of the 25 largest combined statistical areas in the United States, according to the July 1, 2006 U.S. Census Bureau estimates. See the Table of United States Combined Statistical Areas for a sortable table of all 121 Combined Statistical Areas.
Note that not all metropolitan areas are part of a CSA (e.g., the Miami-Fort Lauderdale-Pompano Beach, FL Metropolitan Statistical Area and the Phoenix-Mesa-Scottsdale, AZ Metropolitan Statistical Area.) This table does not represent the 25 largest population centers in the United States. See the Table of United States primary census statistical areas for a sortable table of the largest metropolitan areas of the United States.

Rank	Combined Statistical Area	State(s)	2006 Estimate	2000 Population	1990 Population	Percent Change (2000–2005)	Percent Change (1990–2000)
1	New York–Newark–Bridgeport	NY–NJ–CT–PA	21,976,224	21,361,797	19,710,239	2.5	8.4
2	Los Angeles–Long Beach–Riverside	CA	17,775,984	16,373,645	14,531,529	7.7	12.7
3	Chicago–Naperville–Michigan City	IL–IN–WI	9,725,317	9,312,255	8,385,397	3.8	11.1
4	Washington–Baltimore–Northern Virginia	DC–MD–VA–WV	8,211,213	7,572,647		7.3
5	Boston–Worcester–Manchester	MA–RI–NH	7,465,634	7,298,695		1.8
6	San Jose–San Francisco–Oakland	CA	7,228,948	7,092,596	6,290,008	1.1	12.8
7	Philadelphia–Camden–Vineland	PA–NJ–DE–MD	6,382,714	6,207,223		2.7
8	Dallas–Fort Worth	TX	6,359,758	5,487,956		12.5
9	Houston–Baytown–Huntsville	TX	5,641,077	4,815,122	3,855,180	11.7	24.9
10	Atlanta–Sandy Springs–Gainesville	GA–AL	5,478,667	4,548,344	3,317,380	15.4	37.1
11	Detroit–Warren–Flint	MI	5,410,014	5,357,538	5,095,695	1.3	5.1
12	Seattle–Tacoma–Olympia	WA	3,876,211	3,604,165	3,008,669	5.6	19.8
13	Minneapolis–St. Paul–St. Cloud	MN–WI	3,502,891	3,271,888	2,809,713	6.0	16.4
14	Denver–Aurora–Boulder	CO	2,927,911	2,629,980		9.1
15	Cleveland–Akron–Elyria	OH	2,917,801	2,945,831	2,859,644	-0.5	3.0
16	St. Louis–St. Charles–Farmington	MO–IL	2,858,549	2,754,328	2,629,801	3.1	4.7
†	San Juan–Caguas–Fajardo	PR	2,694,909	2,622,876	2,429,378	2.7	8.0
17	Pittsburgh–New Castle	PA	2,462,571	2,525,730	2,564,535	-1.9	-1.5
18	Sacramento–Arden-Arcade–Yuba City	CA–NV	2,211,790	1,930,149	1,587,249	13.3	21.6
19	Charlotte–Gastonia–Salisbury	NC–SC	2,191,604	1,897,034	1,501,663	11.8	26.3
20	Cincinnati–Middletown–Wilmington	OH–KY–IN	2,147,617	2,050,175	1,880,332	3.1	9.0
21	Orlando–Deltona–Daytona Beach	FL	2,053,623	1,697,906	1,256,429	17.6	35.1
22	Kansas City–Overland Park–Kansas City	MO–KS	2,034,796	1,901,070	1,695,974	6.0	12.1
23	Indianapolis–Anderson–Columbus	IN	1,984,644	1,843,588	1,594,779	6.2	15.6
24	Columbus–Marion–Chillicothe	OH	1,953,575	1,835,189	1,613,711	5.5	13.7
25	Las Vegas–Paradise–Pahrump	NV	1,820,232	1,408,250		24.3

See also

★ Table of United States primary census statistical areas (PCSA)

★ Table of United States Combined Statistical Areas (CSA)

★ Table of United States Metropolitan Statistical Areas (MSA)

★ Table of United States Micropolitan Statistical Areas (μSA)

External links

★ List of Combined Statistical Areas

★ Environmental Protection Agency list of CSAs with populations

★ Census Bureau population data and estimates for CSAs and metropolitan/micropolitan areas

★ US Office of Management and Budget

★ US Census Bureau