No surprise, San Francisco is number one on the list. Silicon Valley is home to some of the world’s most innovative companies, Apple, Facebook, and Google among them. The bulk of the leading "gig economy" platforms, including Uber, are headquartered there. There is some debate about whether the region’s explosive economic growth has it poised for another crash like the end of the dot-com boom, but for now the Bay Area is riding high.

Jeff Chiu/AP/File
Uber driver Karim Amrani sits in his car parked near the San Francisco International Airport parking area in San Francisco (July 15, 2015).