Help End Prison Gerrymandering Prison gerrymandering funnels political power away from urban communities to legislators who have prisons in their (often white, rural) districts. More than two decades ago, the Prison Policy Initiative put numbers on the problem and sparked the movement to end prison gerrymandering.

Can you help us continue the fight? Thank you.

—Peter Wagner, Executive DirectorDonate

Maryland correctional populations of Census 2020 vintage

We recommend using these addresses only for guidance in identifying prison populations in the Census data and warn against assuming that the prisons were in fact counted at that particular location.

Facility Name Prisoners Type Address City Zip County Survey Date
Allegany Co. Det. Ctr. 153 Local 12/31/2013
Anne Arundel County: Ordnance Road Correctional Center 312 Local 12/31/2013
Anne Arundel County: The Jennifer Road Detention Center 452 Local 12/31/2013
Baltimore Central Booking And Intake Center 887 Local 12/31/2013
Baltimore City Correctional Center 486 State 901 Greenmount Avenue Baltimore 21202 Baltimore City 6/30/2012
Baltimore City Detention Center 2,590 Local 12/31/2013
Baltimore County Detention Center 1,184 Local 12/31/2013
Baltimore Pre-Release Unit 187 State 926 Greenmount Avenue Baltimore 21202 Baltimore City 6/30/2012
Brockbridge Correctional Facility 644 State 7930 Brock Bridge Road Jessup 20794 6/30/2012
Calvert Co. Det.Ctr. 249 Local 12/31/2013
Caroline Co. Jail 116 Local 12/31/2013
Carroll Co. Det. Ctr. 243 Local 12/31/2013
Cecil County Community Corrections Center 37 Local 12/31/2013
Cecil County Detention Center 215 Local 12/31/2013
Central Md Correctional Facility 477 State 7301 Buttercup Road Sykesville 21784 6/30/2012
Charles Co. Detention Center 374 Local 12/31/2013
Chesapeake Detention Facility 456 State 401 E. Madison Street Baltimore 21202 Baltimore City 6/30/2012
Cumberland Camp 302 Federal 14601 Burbridge Rd Se Cumberland 21502 Allegany 6/30/2012
Cumberland FCI 1,178 Federal 14601 Burbridge Rd Se Cumberland 21502 Allegany 6/30/2012
Cumberland FCI 1,030 Federal 14601 Burbridge Rd Se Cumberland 21502 Allegany 4/2/2020
Cumberland-Camp 247 Federal 14601 Burbridge Rd Se Cumberland 21502 Allegany 4/2/2020
Dorchester Co. Det. Ctr. 144 Local 12/31/2013
Eastern Correctional Institution 2,631 State 30420 Revells Neck Road Westover 21890 Somerset 6/30/2012
Eastern Correctional Institution-Annex 585 State 30430 Revells Neck Road Westover 21890 Somerset 6/30/2012
Eastern Pre-Release Unit 161 State 700 Flat Iron Square Road Church Hill 21623 Queen Annes 6/30/2012
Frederick Co. Adult Det. Ctr. 350 Local 12/31/2013
Garrett Co. Jail 60 Local 12/31/2013
Harford Co. Det. Ctr. 422 Local 12/31/2013
Howard Co. Det. Ctr. 352 Local 12/31/2013
Jessup Correctional Institution 1,800 State 7800 House Of Correction Rd Jessup 20794 6/30/2012
Jessup Pre-Release Unit 567 State 2000 Toulson Road Jessup 20794 6/30/2012
Kent Co. Det. Ctr. 69 Local 12/31/2013
Maryland Correctional Inst - Hagerstown 2,005 State 18601 Roxbury Road Hagerstown 21746 Washington 6/30/2012
Maryland Correctional Institution - Jessup 1,027 State 7804 Maryland House Of Correction Road Jessup 20794 6/30/2012
Maryland Correctional Institution For Women 802 State 7943 Brockridge Road Jessup 20794 6/30/2012
Maryland Correctional Training Center 2,470 State 18800 Roxbury Road Hagerstown 21746 Washington 6/30/2012
Maryland Reception, Diagnostic & Class Ctr 763 State 550 E. Madison Street Baltimore 21202 Baltimore City 6/30/2012
Metropolitan Transition Center 638 State 954 Forrest Street Baltimore 21202 Baltimore City 6/30/2012
Montgomery Co. Corr. Facililty 767 Local 12/31/2013
North Branch Correctional Institution 1,419 State 14100 Mcmullen Highway, Sw Cumberland 21502 Allegany 6/30/2012
Patuxent Institution 967 State 7555 Waterloo Road Jessup 20794 6/30/2012
Poplar Hill Pre-Release Unit 149 State 20490 Nanticoke Road Quantico 21856 Wicomico 6/30/2012
Prince Georges County Correctional Center 1,273 Local 12/31/2013
Queen Annes Co. Det. Ctr. 116 Local 12/31/2013
Roxbury Correctional Institution 1,639 State 18701 Roxbury Road Hagerstown 21746 Washington 6/30/2012
Somerset Co. Det. Ctr. 87 Local 12/31/2013
Southern Maryland Pre-Release Unit 158 State 14320 Oaks Road Charlotte Hall 20622 6/30/2012
St. Marys Co. Det. Ctr. 238 Local 12/31/2013
Talbot Co. Jail 80 Local 12/31/2013
Threshold, Inc 28 Private 1702 St. Paul Street Baltimore 21202 Baltimore City 6/30/2012
Volunteers of America - Residential Re-Entry Center 60 Private 5000 E. Monument Street Baltimore 21205 Baltimore City 6/30/2012
Washington Co. Det. Ctr. 365 Local 12/31/2013
Western Correctional Institution 1,638 State 13800 Mcmullen Highway, Sw Cumberland 21502 Allegany 6/30/2012
Wicomico Co. Det. Ctr. 400 Local 12/31/2013
Worcester Co. Jail 335 Local 12/31/2013

This table draws data from four sources:

  • Federal prisons on April 2, 2020: The Prison Policy Initiative downloaded the weekly population list from the Bureau of Prisons for that date.
  • State and federal correctional facilities on June 30, 2012 were extracted from: United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics. Census of State and Federal Adult Correctional Facilities, 2012. ICPSR37294-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2020-02-06. doi:10.3886/ICPSR37294.v1. County data retrieved from postal service database.
  • Local jails' average daily populations from January 1, 2013 to December 31, 2013 were extracted from: United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics. Census of Jail Facilities, 2013. ICPSR36128-V4. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2018-04-25. doi:10.3886/ICPSR36128.v4
  • Jails in Indian Country populations on June 30, 2016 were extracted from: United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics. Annual Survey of Jails in Indian Country, 2016. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2018-05-23. doi:10.3886/ICPSR37006.v1

Military prisons and state halfway houses are not included in the above table as we were not able to locate an appropriate national database of these types of facilities. Juvenile facilities are not included in the above because the Census Bureau counts these facilities separately from the adult correctional institutions that are the focus of our work. Where necessary, state-specific sources will be more useful for identifying juvenile facilities.

We do, however, have a list (without population information) of all federal halfway houses as of April 2, 2020 [XLSX].

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