Here are the number of road fatalities in 2012 per 100,000 people in each state:
Business Insider/Andy Kiersz, data from Michael Sivak, University of Michigan
North Dakota, Montana, and Wyoming are the most dangerous states, with over 20 deaths per 100,000 people each. Meanwhile, more densely populated areas tend to be safer. New York had about 6 deaths per 100,000 people, Massachusetts about 5 per 100,000, and in Washington D.C., there were only about 2 deaths per 100,000 people.