The Washington, D.C. metropolitan area is the hottest spot in the country for entrepreneurship according to a new report from the Kauffman Index of Growth Entrepreneurship. The ranking is based on a combination of how many new startups there are, how startups in the area have scaled in the course of a decade and how many companies show rapid growth. All told, D.C. easily beats out Austin, Columbus, San Jose and Nashville, the next ranked cities, and far ahead of Boston, New York or other hubs of innovation.