I'd always felt this but had never seen the statistics. The Bay area has more than twice the the percentage of employed artists, when compared to the national average of 1.4%.
I know I am only one person in this statistic, but I felt like my art career took off when I moved here. It is especially an interesting area because not only artists live here, but creative tech people live here too. I've always felt this area was a blend of technology and art, which results in a lot of innovation and interesting things.
*National Endowment for the Arts http://www.nea.gov/research/ResearchReports_chrono.html