Saw this, May be this has something to do with it.

Interesting almost all SoCal with the exception of Ventura are on the top ten in population growth.

So much for the theory that everyone is fleeing SoCal in droves.

The 10 Counties with the Largest Numeric Increase from April 1, 2010, to July 1, 2011

1. Harris, Texas 88,452
2. Los Angeles, Calif. 70,451
3. Maricopa, Ariz. 63,127
4. Miami-Dade, Fla. 58,331
5. Riverside, Calif. 49,979
6. Dallas, Texas 47,875
7. Orange, Calif. 45,513
8. San Diego, Calif. 44,756
9. Bexar, Texas 41,376
10. Tarrant, Texas 40,776