Here are a few fun charts of SF and Bay Area demographics.

Population

All Bay Area 
counties have been rapidly growing in population. San Francisco is the second most densely populated city in the country. Driving around San Francisco you'll know it is only getting more dense.

Education

Along with 
Washington DC and Seattle, the Bay Area ranks among the best educated metro areas in the country.

Residents

Some local context to the current political issue of immigration. The Bay Area would be a totally different place without it.

Income