This is an easy one, so here you go.
Yesterday the US Census released its annual population estimates for counties and metropolitan areas for 2009. Listed below are the 10 largest Combined Statistical Areas, which along with MSAs and UAs are one of the three main measures of metropolitan population. Ryan Avent has a discussion going about the Census estimates.
| Rank | Area | Population |
| 1 | New York-Newark-Bridgeport | 22, 232, 494 |
| 2 | Los Angeles-Long Beach-Riverside | 17, 820, 893 |
| 3 | Chicago-Naperville-Michigan City | 9, 804, 845 |
| 4 | Washington-Baltimore-Northern Virginia | 8, 440, 617 |
| 5 | Boston-Worcester-Manchester | 7, 609, 358 |
| 6 | San Jose-San Francisco-Oakland | 7, 427, 757 |
| 7 | Dallas-Fort Worth | 6, 805, 275 |
| 8 | Philadelphia-Camden-Vineland | 6, 533, 122 |
| 9 | Houston-Baytown-Huntsville | 5, 968, 586 |
| 10 | Atlanta-Sandy Springs-Gainesville | 5, 831, 778 |
The next ten are (in order) Detroit, Seattle, Minneapolis, Denver, Saint Louis, Cleveland, Orlando, Pittsbugh, Sacramento, Charlotte.
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