I wish they gave some data on domestic net migration. I wonder if there is that large of a net migration out of California or not. I suspect there is out of Southern California, but wouldn't be surprised if the Bay Area, especially the Silicon Valley, held it's ground.
There is in fact data on domestic net migration.
http://www.census.gov/popest/data/counties/totals/2011/CO-EST2011-05.html
Excellent! Thank you!
Looks like Los Angeles County had more net domestic migration out of it than all of California, meaning the rest of California had net migration in. Riverside County gained a lot from domestic net migration and modest increases in Orange and Contra Costa County. Santa Clara lost people, which surprised me, but San Francisco and San Mateo gained people. And while Riverside was gaining 14,000 people from net domestic migration, San Bernardino only gained like half a thousand. Very interesting.
the interesting thing is that this net outmigration in LA County is nothing new. I remember reading somewhere that if not for external factors, Los Angeles County would have lost a million people in the 1970s.