My friend Ian Hathaway has a Brookings paper out on startup accelerator programs in the US. Here is a summary of the current state of play:
In terms of their geography, accelerator programs are unsurprisingly concentrated in the well-known technology startup hubs and major cities of San Francisco-Silicon Valley, Boston-Cambridge, and New York. These three regions account for about 40 percent of all accelerators in the United States, and almost two-thirds of accelerator-funded deals between 2005 and 2015.
However, a good amount of activity is occurring outside of these prime tech hubs. In fact, fully 54 metropolitan statistical areas and four non-metropolitan regions spread across 35 states and the District of Columbia have accelerator programs today. A number of surprises show up in terms of cities with more than two accelerators, including Chattanooga, Nashville, Cincinnati, Milwaukee, and Honolulu.
Colorado might be the most interesting area. The birthplace of accelerator pioneer TechStars, Colorado has accelerators in far-flung places like Durango and Telluride, and Boulder is home to CanopyBoulder — an accelerator program focused on the budding cannabis industry in that state.