What’s New
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The Cost We No Longer Pay:
How Fines and Fees Reform Delivered Billions in Relief for Families by Fines and Fees Justice Center
May 22: Research Library: Policing
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New “Key Statistics” on our website put the most requested numbers about mass incarceration at your fingertips
We’ve made it easier to access the topline statistics about the criminal legal system.
May 18: Prison Policy Initiative Blog
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Updated data and charts: Women’s incarceration, national prison population counts, psychological distress behind bars, and more
Updated data visualizations illustrate the scale of — and disparities within — mass incarceration.
April 27: Briefings
Featured report
Mass Incarceration: The Whole Pie 2026
Be sure to check out our other Whole Pie reports that focus specifically on the incarceration of women and the incarceration of young people.
Mass incarceration, state by state
Learn about the national prison crisis and how we can begin to turn the tide on mass incarceration. Then, drill down to your state. Be sure to also check out our pages focused on D.C., and the incarceration of Native people.
If our work is new to you, you might want to check out our 2024-2025 annual report.
Recommended Reading:
Tracking Trump's criminal legal system moves
The Administration is making America's criminal legal system harsher, less effective, and even more unjust.
Research Library
We curate a searchable database of 4,000+ original research reports, organizing each entry by topic and adding brief summaries.
Mass Incarceration: The Whole Pie
The U.S. incarcerates nearly 2 million people. Where are they locked up and why? Read our report.
Bad Behavior
This national report explains how prison disciplinary policies manufacture misconduct and severly punish incarcerated people.