Prison Overcrowding: Illinois

Below is a summary of information including: statistics from Illinois’ Department of Corrections, an overview of the state’s prison overcrowding dilemma, as well as helpful references and points of contact for those interested in resolving the problem.

Facts and Figures 2007-2008

DOC Costs 

  • Annual budget: $1.24 billion
  • Percentage of the state General Fund allocated in the 2010 Budget to Corrections: 4%
  • Average annual cost per inmate: $27,165

DOC Staff and Population

  • Total department active personnel: 11,000
  • Total number of facilities: 36
  • Total incarcerated under DOC jurisdiction: 45,548
  • Average length of stay: 1.9 years
  • Average age: 35 years

Organization of state divisions, view here.


  • Facilities: 19
  • Population: 35,000

 Overcrowding Quick Facts

  • The Illinois inmate population has increased by 5% since 2004, while costs have escalated by 25%
  • For FY2010, the Corrections budget was cut by $125 million

Points of Contact

For general inquiries about the Department’s activities, send an email to, or call (217) 558-2200, extension 2008

Illinois Department of Corrections
1301 Concordia Court
P.O. Box 19277
Springfield, IL 62794-9277

Organization of DOC Executive Staff, view here

News and Media

  • Secret Illinois policy allows dangerous criminals back on the streets early, read more.
  • Inmates released early to save money, read more.
  • Budget cuts cause early release of offenders, read more.
  • “Cop Out” program allows inmates free to relieve overcrowding, read more.

Helpful Links

See also:

Indiana Prison Overcrowding