Those snowbirds are starting to nest in retirement areas rather than just migrating seasonally.  The U.S. Census Bureau released the 2010 Census  that showed the resident population of the United States on April 1, 2010, was 308,745,538, an increase of 9.7% over the 2000 U.S. resident population of 281,421,906.  The census showed that California was the most populist state with over 37 million people.  States with the highest percentage increases between 2000 and 2010 were heavily concentrated in popular retirement areas that include the southern and southwestern areas of the United States.  Some of the increases in areas with high concentrations of retirees were:

Florida – 17.6% increase

California – 10% increase

Colorado – 16.9% increase

Arizona – 24.6% increase

Georgia – 18.3% increase

Nevada – 35% increase

North Carolina – 18.5% increase

Texas – 20.6% increase

Visit the 2010 Census Data