From the US Energy Information Administration:
The number of retail fueling stations offering motor fuel that can be up to 85% ethanol, known as E85, has grown rapidly since 2007. According to the Alternative Fuels Data Center (AFDC), Minnesota continues to lead the nation, with 336 E85 retail locations. However, in recent years, states outside of the Midwest have experienced some of the fastest growth. Currently, 2% of all retail stations in the United States offer E85, serving the approximately 5% of the U.S. light-duty vehicle fleet capable of running on E85.
Photo credit: US Energy Information Administration