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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

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

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

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

• We graded every state’s response to the coronavirus in prisons and jails. Massachusetts got an F+
• Punishing Poverty: The high cost of probation fees in Massachusetts
• How much do incarcerated people in Massachusetts earn for their work in prison?
• Massachusetts prisons charge a $3 copay to incarcerated people, putting health at risk
• The Company Store: A deeper look at prison commissaries in Massachusetts
• Research from Massachusetts: Prisons could do much more to prevent opioid overdose deaths among people leaving prison
• We graded the parole release systems of all 50 states - Massachusetts gets an F
• Who's helping the 5,061 women released from Massachusetts correctional facilities each year?
• How Missouri reformed its juvenile justice system (from our report Youth Confinement: The Whole Pie)

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:

Protecting family communication and contact in Massachusetts

• People in Massachusetts jails often face high first-minute rates for phone calls
• Protecting visitation and mail in Massachusetts prisons
• New video: The high cost of calls home from the Hampden County Jail
• Massachusetts residents say NO to prison visitor dog sniffing policy
• Letter Urging the Massachusetts Department of Corrections to not subject prison visitors to dog searches

Sentencing enhancement zones in Massachusetts

• Reaching too far, coming up short: How large sentencing enhancement zones miss the mark
• PRRAC Researcher Report: Sentencing Enhancement Zones Fail to Protect Children (Poverty & Race, November/December 2008)
• The Geography of Punishment: How Huge Sentencing Enhancement Zones Harm Communities, Fail to Protect Children, by Aleks Kajstura, Peter Wagner and William Goldberg, July 2008
• Mass. court to decide when sentencing enhancement zone reform takes effect
• "Smart on crime": Our letter to the Boston Herald
• "School Zone Laws Don’t Work": Our letter to the Valley Advocate

Prison-based gerrymandering in Massachusetts

• Massachusetts delivers prison gerrymandering resolution to Census Bureau
• Ending prison gerrymandering in Massachusetts campaign and resource page
• Massachusetts Legislature Calls on U.S. Census Bureau: Support Fair Redistricting, End Prison Gerrymandering
• Prison Gerrymandering in Massachusetts: How the Census Bureau prison miscount invites phantom constituents to town meeting
• Importing Constituents: Prisoners and Political Clout in Massachusetts

Protecting women from harsh punishments in Massachusetts

• Massachusetts women do not need a new jail
• Mass. anti-shackling bill signed into law
• Massachusetts women need more services, not more jail cells
• "Don’t sink more funds into jails for women": Our letter to the Daily Hampshire Gazette, April 2006

Our other victories and advocacy in Massachusetts

• Massachusetts removes major roadblock to re-entry: unnecessary license suspensions
• Ending harmful driver's license suspensions in Massachusetts
• Massachusetts Chief Justice Gants cites our research, calls for reform
• Prison Policy Initiative helps overturn a harmful banishment ordinance in Massachusetts
• Affidavit of Peter Wagner, August 14, 2006 in opposition to a Revere, MA city ordinance that would banish people classified as level 3 sex offenders from the city.
• Mass. Legislature should pass Innocence Commission bill
• Prison Policy Initiative on Massachusetts's counter-productive plan to charge prisoners for their incarceration
• Do you know where the children are? A Report of Massachusetts Youth Unlawfully Held Without Bail, by Barbara Fedders (Criminal Justice Institute at Harvard Law School and Prison Policy Initiative Board Member) and Barbara Kaban (Children’s Law Center), September 15, 2006
• Jim Crow in Massachusetts? Prisoner disenfranchisement, by Peter Wagner, October 31, 2004.
• Massachusetts Disenfranchises its Prisoners November 2000, written for Mass Dissent

Other resources

• Research on Massachusetts in our Research Library