Today, there are 2.3 million people in the nation’s prisons and jails — a 500 percent increase over the last forty years. With almost one in 100 American adults behind bars, our incarceration rate is the world’s highest. This fact sheet provides an update to findings on state imprisonment trends originally outlined in The Reverse Mass Incarceration Act. It analyzes data from all 50 states on imprisonment and crime from 2006 (as bipartisan criminal justice reforms generally began around 2007) through 2014 (the most recent year of data).