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Massachusetts has an incarceration rate of 324 per 100,000 people (including prisons, jails, immigration detention, and juvenile justice facilities), meaning that it locks up a higher percentage of its people than many wealthy democracies do. Read on to learn more about who is incarcerated in Massachusetts and why.

Are you looking for information on what jails and prisons in Massachusetts are doing to stop COVID-19? See our regularly-updated coronavirus response page.

22,000 people from Massachusetts are behind bars

Additionally, the number of people impacted by county and city jails in Massachusetts is much larger than the graph above would suggest, because people cycle through local jails relatively quickly. Each year, at least 70,000 different people are booked into local jails in Massachusetts.

Rates of imprisonment have grown dramatically in the last 40 years

Also see these Massachusetts graphs:

total numbers rather than rates.
Women’s prisons: Incarceration Rates | Total Population
Men’s prisons: Incarceration Rates | Total Population

Today, Massachusetts’s incarceration rates stand out internationally

graphic comparing the incarceration rates of the founding NATO members with the incarceration rates of the United States and the state of Massachusetts. The incarceration rate of 698 per 100,000 for the United States and 324 for Massachusetts is much higher than any of the founding NATO members In the U.S., incarceration extends beyond prisons and local jails to include other systems of confinement. The U.S. and state incarceration rates in this graph include people held by these other parts of the justice system, so they may be slightly higher than the commonly reported incarceration rates that only include prisons and jails. Details on the data are available in States of Incarceration: The Global Context. We also have a version of this graph focusing on the incarceration of women.

People of color are overrepresented in prisons and jails

racial and ethnic disparities between the prison/jail and general population in MA as of 2010

See also our detailed graphs about Whites, Hispanics, and Blacks in Massachusetts prisons and jails.

Massachusetts's criminal justice system is more than just its prisons and jails

Our other articles about Massachusetts

Our advocacy in Massachusetts

The Prison Policy Initiative is headquartered in Easthampton, Massachusetts. In addition to our national research, we have joined and led several campaigns for criminal justice reform in Massachusetts, including the following: