Jaclyn King, 28, smiles as she arrives at her job at a Denver hospital on Wednesday, June 27, 2012. King grew up in the suburbs of Denver and now lives in the city and says she’ll never return to the suburbs because she wants to avoid the long commutes her parents had. For the first time in a century, America's largest cities are growing at a faster rate than their surrounding suburbs as young adults seeking a foothold in the weak job market shun home-buying and stay put in bustling urban centers. (AP Photo/Kristen Wyatt)

Associated Press
Jaclyn King, 28, smiles as she arrives at her job at a Denver hospital on Wednesday, June 27, 2012. King grew up in the suburbs of Denver and now lives in the city and says she’ll never return to the suburbs because she wants to avoid the long commutes her parents had. For the first time in a century, America's largest cities are growing at a faster rate than their surrounding suburbs as young adults seeking a foothold in the weak job market shun home-buying and stay put in bustling urban centers. (AP Photo/Kristen Wyatt)
Jaclyn King, 28, smiles as she arrives at her job at a Denver hospital on Wednesday, June 27, 2012. King grew up in the suburbs of Denver and now lives in the city and says she’ll never return to the suburbs because she wants to avoid the long commutes her parents had. For the first time in a century, America's largest cities are growing at a faster rate than their surrounding suburbs as young adults seeking a foothold in the weak job market shun home-buying and stay put in bustling urban centers. (AP Photo/Kristen Wyatt)
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