More than half of the executions carried out in the U.S. since the death penalty was reinstated in 1976 stem from murder cases in just 2 percent of the nation’s counties representing 15 percent of the population, according to a new study by the Death Penalty Information Center.

The map below shows the 62 counties that accounted for 686 executions during that period. Click on a county to view more information. Zoom in on the map for a closer look.