List of law enforcement agencies in Illinois

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This is a list of law enforcement agencies in the state of Illinois.

According to the US Bureau of Justice Statistics' 2008 Census of State and Local Law Enforcement Agencies, the state had 877 law enforcement agencies employing 41,277 sworn police officers, about 321 for each 100,000 residents.[1]


At the state level, there are at least 11 law enforcement agencies. At the county level, there are sheriffs, forest preserve police and other specialized police forces. At the local level, most cities and many towns and villages have municipal police forces, park district police forces and even local specialized police forces. Many colleges and universities as well as community colleges also have their own campus police that are often sworn police officers.

In 2000, Illinois was ranked fourth in the U.S. in the number of full-time sworn officers with 321 per 100,000 persons, behind Louisiana (415), New York (384) and New Jersey (345).[2] In this ranking, only New York had a higher total population than Illinois. Illinois is also near the top of most law enforcement numbers lists, such as number of agencies per state, number of agencies with special jurisdictions and number of local police agencies.[2] Even taking into account that Illinois is the fifth most populous state, many of the ratios are higher than more populated states.

State agencies[edit]

County agencies[edit]

Sheriff's departments/offices[edit]

County Forest Preserve police departments[edit]

Other county departments[edit]

Municipal agencies[edit]

Park District police agencies[edit]

Special district agencies[edit]

College and university agencies[edit]

Community or junior college agencies[edit]

Railroad Police Departments[edit]

Defunct agencies[edit]

See also[edit]


  1. ^ 2008 Census of State and Local Law Enforcement Agencies, by Brian A Reaves, US Department of Justice, Office of Justice Programs, Bureau of Justice Statistics, July 2011
  2. ^ a b "Census of State and Local Law Enforcement Agencies, 2000". Bureau of Justice Statistics. U.S. Department of Justice. October 2002. Retrieved September 17, 2009. [dead link]
  3. ^ Why was evidence destroyed in 130 pending criminal cases? by Elizabeth Donald, News-Democrat August 12, 2014
  4. ^ Veteran cop pleads not guilty to stealing department money; by Marcella Mangan, 18 August 2014 accessed 19 August 2014