The following EV charging station count is from the U.S. Department of Energy, Alternative Fuels Data Center which keeps track of the number of electric vehicle charging stations from data provided by the major charging networks as well as other sources. It may not be a perfect count but it is close enough in my opinion to get a relative sense of the size and growth of the public charging infrastructure. The figures include planned stations, 120v, Level 1 outlets as well as stations marked as private. Charging station count was captured on December 31, 2014.
Maryland: 282 sites, 650 ports
Virginia: 237 sites, 604 ports
Washington, DC: 61 sites, 134 ports
West Virginia: 28 sites, 101 ports
Delaware: 16 sites, 26 ports