To identify the most and least violent states, 24/7 Wall St. created an index based on four measures: the murder rate, the violent crime rate excluding murder, firearms deaths, and the incarceration rate. We drew on the 2012 United States Peace Index from the Institute for Economics and Peace. We gave full weight in the index to two of the measures: the number of murders and the number of violent crimes (excluding murder) per 100,000 people, both of which came from the FBI’s 2018 Uniform Crime Report. Incarceration rates, which capture state prisons only, were given a one-quarter weighting and came from the Bureau of Justice Statistics and are for 2017.
Figures firearms deaths are for 2018 and are from the Centers for Disease Control and Prevention. This component received a three-quarter weight. These data sets are frequently based on disparate and inconsistent population totals, so all state rates for the purposes of this index were calculated based on 2018 one-year Census American Community Survey population counts. Data on crime for cities and metropolitan areas also came from the FBI and incorporates the FBI’s population estimates.