“Here’s the list: Los Angeles, California; San Francisco, California; New York City; Seattle, Washington; Atlanta, Georgia. Georgia offers a tax credit for electric vehicles that is equal to 20% of the vehicle’s cost, up to a maximum amount of $5,000. California has many charging stations, which might have contributed to its presence in the list above, but it also offers a $2,500 incentive formerly http://www.afdc.energy.gov/laws/laws/CA/tech/3270 for electric vehicles. New York City has its own EV policies that surely helped stimulate EV adoption a bit, but the fact that it is the largest city in the US (by far) is also surely a factor.”
http://cleantechnica.com/2013/08/19/top-electric-car-cities-us/