Companies do a fair amount of giving, but on an individual level, the Bay Area isn't particularly generous. San Mateo county is in the bottom 1/3 for '% of income given', Santa Clara in the bottom 1/4, SF is a bit better and is in the 42nd percentile for counties.

Long Link to Data:

http://philanthropy.com/article/Interactive-How-America-Give...},"obj_data":null,"conveyor":0,"noSplash":1}