Silicon Valley, CA
Home of Apple, Google, Facebook, Stanford ... a tech hub that attracts startup enthusiasts from around the world.
Home of Optimov, iBotta, Galvanize, Convercent, ProtectWise, FullContact, PingID, eBags ... the metro area has the country's second highest educated workforce and more technical workers per capita than any city in America. Denver is also headquarters for Arrow Electronics (Fortune 25) and VF Corp (Northface, Jansport and many other brands).
Home of TechStars, SendGrid, Sphero, TeamSnap, Yonomi, Automox, Backbone. Boulder is known for creativity: it has the highest density of tech start-ups of any city in America and it's ranked 3rd for the number of working artists per capita. Because of its strong technical talent-base, Boulder houses fairly large offices for Google and Amazon, too. 103,166 residents, including 30,265 students at the University of Colorado.