6. San Francisco, CA
When you think of cities popular for young people, San Francisco of course comes to mind. A cornerstone of startup culture, the city is the birthplace of tech favorites like Twitter, Yelp, Dropbox, Wikipedia, and StumbleUpon, and added 18,000 jobs between November 2010 and November 2011. Plus, a new program, the Civic Startup Accelerator is working to pair top startup companies with City Hall to get new and innovative technology worked into the government sector — and famed angel investor Ron Conway has already agreed to advise the program. It’s no surprise that the unemployment for San Francisco County is 5.4 percent for 25-34-year-olds.