SOURCE: TechNet, Progressive Policy Institute; GRAPHIC: George Petras, USA TODAY

These are the leading U.S. technology hubs, according to TechNet's Metro Startup Index, a formula that measures jobs, investment and potential growth.

These cities are fostering a culture for tech start-ups, according to TechNet's Metro Startup Index, a formula that measures jobs, investment and potential growth.

These cities are fostering a culture for tech start-ups, according to TechNet's Metro Startup Index, a formula that measures jobs, investment and potential growth.

These cities are fostering a culture for tech start-ups, according to TechNet's Metro Startup Index, a formula that measures jobs, investment and potential growth.