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

Montana 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
Alternatives Inc. - Alpha House 205 Private 3109 1St Avenue N Billings 59103 Yellowstone 6/30/2012
Beaverhead County Jail 8 Local 12/31/2013
Big Horn County Jail 37 Local 12/31/2013
Blackfeet Adult Detention Center 58 Indian Country 6/30/2016
Broadwater County Detention Center 32 Local 12/31/2013
Butte Pre-Release Center Inc. 56 Local 471 East Mercury Butte 59701 Silver Bow 6/30/2012
Butte-Silver Bow Co. Det. Ctr. 76 Local 12/31/2013
Cascade County Regional Adult Detention Center 147 Local 3800 Ulm North Frontage Road Great Falls 59405 Cascade 6/30/2012
Cascade County Regional Jail 362 Local 12/31/2013
Crossroads Correctional Center 621 Local 12/31/2013
Crossroads Correctional Center - CCA 547 Private 75 Heath Road Shelby 59474 Toole 6/30/2012
Dawson County Detention Center 140 Local 440 Colorado Blvd. Glendive 59330 Dawson 6/30/2012
Dawson County Jail 172 Local 12/31/2013
Deer Lodge Co. Jail 24 Local 12/31/2013
Fallon County Jail 6 Local 12/31/2013
Flathead Adult Detention Center 11 Indian Country 6/30/2016
Flathead County Detention Center 99 Local 12/31/2013
Fort Belknap Adult Detention Center 21 Indian Country 6/30/2016
Fort Peck Indian Youth Service Center 21 Indian Country 6/30/2016
Fort Peck Police Department And Adult Detention Center 71 Indian Country 6/30/2016
Fort Peck Transitional Living Unit N/A Indian Country 6/30/2016
Gallatin County Detention Center 143 Local 12/31/2013
Gallatin County Reentry Program 8 Local 675 S. 16Th Ave Bozeman 59715 Gallatin 6/30/2012
Glacier County Detention Center 16 Local 12/31/2013
Granite County Jail 1 Local 12/31/2013
Great Falls Pre-Release 66 Local 1019 15Th Street N Great Falls 59401 Cascade 6/30/2012
Helena Pre-Release Center 26 Private 805 Collen Street Helena 59101 Yellowstone 6/30/2012
Hill County Jail 50 Local 12/31/2013
Jefferson County Jail 17 Local 12/31/2013
Lake County Jail 47 Local 12/31/2013
Lewis And Clark County Jail 71 Local 12/31/2013
Liberty County Jail 2 Local 12/31/2013
Lincoln County Jail 21 Local 12/31/2013
Mineral County Jail 10 Local 12/31/2013
Missoula Correctional Services, Inc. 38 Private 2350 Mullan Road Missoula 59808 Missoula 6/30/2012
Missoula County Detention Facility 367 Local 12/31/2013
Montana State Prison 1,456 State 400 Conley Lake Road Deer Lodge 59722 Powell 6/30/2012
Montana Women's Prison 192 State 701 S 27Th Street Billings 59101 Yellowstone 6/30/2012
Musselshell County Jail 6 Local 12/31/2013
Northern Cheyenne Adult Detention Center 35 Indian Country 6/30/2016
Northern Cheyenne Youth Service Center 22 Indian Country 6/30/2016
Park County Jail 15 Local 12/31/2013
Passages 65 Local 1001 South 27Th Street Billings 59101 Yellowstone 6/30/2012
Phillips County Jail 2 Local 12/31/2013
Pondera Co. Jail 6 Local 12/31/2013
Powder River Co. Jail 1 Local 12/31/2013
Powell Co. Jail 8 Local 12/31/2013
Ravalli Co. Adult Det. Ctr. 48 Local 12/31/2013
Richland Co. Jail 13 Local 12/31/2013
Rocky Boy Adult Detention Center 61 Indian Country 6/30/2016
Roosevelt Co. Jail 14 Local 12/31/2013
Rosebud Co. Jail 28 Local 12/31/2013
Sanders Co. Jail 1 Local 12/31/2013
Sheridan Co. Jail 1 Local 12/31/2013
Toole Co. Jail 6 Local 12/31/2013
Treasure State Correctional Training Center 50 State 1100 Conley Lake Road Deer Lodge 59722 Powell 6/30/2012
Valley Co. Jail 20 Local 12/31/2013
Watch West 110 Private 700 Little Street Warm Springs 59711 6/30/2012
Watch East 53 Private 700 Little Street Glendive 59330 Dawson 6/30/2012
Wheatland Co. Jail N/A Local 12/31/2013
Yellowstone Co. Det. Fac. 448 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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