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Runner-up: Arizona
Population: 6,392,017
Growth rate: 24.6%
Unemployment rate: 9.4%

Arizona's population has nearly quadrupled since 1970, no doubt benefiting from the rise of air conditioning.

The recession, however, has slowed migration to Arizona. Phoenix, for example had a net gain of about 50,000 residents from 2007 to 2008, about half its average during the boom years.


NEXT: #3: Utah
Last updated December 21 2010: 12:52 PM ET
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