The Bay Area is around 6%, on the same order of magnitude as people of Chinese (10%), black (6%), Filipino (5%) or Jewish (4.5%) ancestry in the Bay. Depending on exactly how you group things, they're the 4th (after white non-Hispanic, Hispanic, and Chinese) largest Bay Area ethnic group. (src: https://en.wikipedia.org/wiki/San_Francisco_Bay_Area#/media/...)