Last year it was revealed that tens of thousands more people left the state of California than came in 2017. Now we know, per the U.S. Census Bureau, that over 35,000 more people left the Bay Area than came in between the years 2013 - 2017.
Some aren't leaving the Bay Area entirely, but moving around a bit. San Francisco County & San Mateo County residents were more likely to move to Alameda County & Alameda County residents were more likely to move to Contra Costa County during the five year time period.
Another study from earlier this year showed that 53% of Californians are contemplating leaving the state, mostly due to high cost of living.