Tesla Model S
The DOE Office of Energy Efficiency & Renewable Energy's released some interesting data about plug-in electric vehicle density in the U.S. (as of 2015).
In rank of EVs per 1,000 people, California is second to none with 4.68 plug-ins per 1,000 people.
Hawaii comes in at #2 at 2.94 persons per thousand, while three more states exceed 2.0: Washington (2.32), Georgia (2.2), and Oregon (2.04). Of note, without its $5,000 EV credit Georgia's number is pretty much stagnant.
Three other states exceed 1 per 1,000 persons owning a plug-in: - Vermont (1.67), Colorado (1.09) and Distric Of Columbia (1.01).
Worst of the pack? Good old Mississippi, on average you need 11,000 people to see just one plug-in vehicle (.09%).
"In 2015, there were five states with more than two plug-in vehicles (PEVs) registered per 1,000 people. California had the highest concentration of PEVs with 4.68 PEVs per 1,000 people.
Hawaii had the second highest concentration with nearly three PEVs per 1,000 people followed by Washington, Georgia, and Oregon with about two PEVs per 1,000 people. Georgia is the only eastern state with over 2 PEVs per 1,000 people, likely due to generous state incentives that were offered until the summer of 2015. Mississippi had the lowest concentration of PEVs, but all 50 states and the District of Columbia had at least some PEVs."
PEV Registrations per 1,000 People by State, 2015 (source: energy.gov)