Prison Policy Initiative
Huge national data page! https://www.prisonpolicy.org/data/
New York City’s Recidivisim Data Tool:
New York City’s Data Analytics Recidivism Tool (DART), an initiative of the Mayor’s Office of the Criminal Justice Coordinator, brings data about recidivism among New York City defendants to the public for the first time. Working together, policy makers, researchers, journalists, students and criminal justice professionals can study the factors that drive re-arrest rates, focus their efforts to reduce recidivism and build a more effective justice system and safer communities.
DART website: http://126.96.36.199/index.php?m=about