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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' 2018 Census of State and Local Law Enforcement Agencies, the state had 846 law enforcement agencies employing 48,240 sworn police officers, about 379 for each 100,000 residents.^[1]

State agencies

Illinois Attorney General's Office
- Department of Investigations
- Illinois Attorney General Police
Illinois Commerce Commission Police
Illinois Department of Corrections
Illinois Department of Human Services Police Department
Illinois Department of Natural Resources
- Illinois Conservation Police
Illinois Department of Revenue Police
- Bureau of Criminal Investigations
Illinois Gaming Board
Illinois Law Enforcement Training and Standards Board
Illinois Secretary of State
- Illinois Secretary of State Capitol Police
- Illinois Secretary of State Police
Illinois State Fire Marshal Arson Investigation
Illinois State Police

County agencies

Sheriff's Offices

Adams County Sheriff's Office
Alexander County Sheriff's Office
Bond County Sheriff's Office
Boone County Sheriff's Office
Brown County Sheriff's Office
Bureau County Sheriff's Office
Calhoun County Sheriff's Office
Carroll County Sheriff's Office
Cass County Sheriff's Office
Champaign County Sheriff's Office^[2]
Christian County Sheriff's Office
Clark County Sheriff's Office
Clay County Sheriff's Office
Clinton County Sheriff's Office
Coles County Sheriff's Office
Cook County Sheriff's Office
Crawford County Sheriff's Office
Cumberland County Sheriff's Office
DeKalb County Sheriff's Office
Dewitt County Sheriff's Office
Douglas County Sheriff's Office
DuPage County Sheriff's Office
Edgar County Sheriff's Office
Edwards County Sheriff's Office
Effingham County Sheriff's Office^[3]
Fayette County Sheriff's Office
Ford County Sheriff's Office
Franklin County Sheriff's Office
Fulton County Sheriff's Office
Gallatin County Sheriff's Office
Greene County Sheriff's Office
Grundy County Sheriff's Office
Hamilton County Sheriff's Office
Hancock County Sheriff's Office
Hardin County Sheriff's Office
Henderson County Sheriff's Office
Henry County Sheriff's Office
Iroquois County Sheriff's Office^[4]
Jackson County Sheriff's Office
Jasper County Sheriff's Office
Jefferson County Sheriff's Office
Jersey County Sheriff's Office
Jo Daviess County Sheriff's Office
Johnson County Sheriff's Office
Kane County Sheriff's Office
Kankakee County Sheriff's Office^[5]
Kendall County Sheriff's Office
Knox County Sheriff's Office
LaSalle County Sheriff's Office
Lake County Sheriff's Office
Lawrence County Sheriff's Office
Lee County Sheriff's Office
Livingston County Sheriff's Office
Logan County Sheriff's Office
Macon County Sheriff's Office
Macoupin County Sheriff's Office
Madison County Sheriff's Office^[6]
Marion County Sheriff's Office
Marshall County Sheriff's Office
Mason County Sheriff's Office
Massac County Sheriff's Office
Mc Donough County Sheriff's Office
Mc Henry County Sheriff's Department
Mc Lean County Sheriff's Office
Menard County Sheriff's Office
Mercer County Sheriff's Office
Monroe County Sheriff's Office
Montgomery County Sheriff's Office
Morgan County Sheriff's Office
Moultrie County Sheriff's Office
Ogle County Sheriff's Office
Peoria County Sheriff's Office^[7]
Perry County Sheriff's Office
Piatt County Sheriff's Office
Pike County Sheriff's Office
Pope County Sheriff's Office
Pulaski County Sheriff's Office
Putnam County Sheriff's Office
Randolph County Sheriff's Office
Richland County Sheriff's Office
Rock Island County Sheriff's Office
Saint Clair County Sheriff's Office
Saline County Sheriff's Office
Sangamon County Sheriff's Office
Schuyler County Sheriff's Office
Scott County Sheriff's Office
Shelby County Sheriff's Office
Stark County Sheriff's Office
Stephenson County Sheriff's Office
Tazewell County Sheriff's Office
Union County Sheriff's Office
Vermilion County Sheriff's Office
Wabash County Sheriff's Office
Warren County Sheriff's Office
Washington County Sheriff's Office
Wayne County Sheriff's Office
White County Sheriff's Office
Whiteside County Sheriff's Office
Will County Sheriff's Office
Williamson County Sheriff's Office
Winnebago County Sheriff's Office
Woodford County Sheriff's Office

County Forest Preserve police departments

Forest Preserve District of Cook County, Department of Law Enforcement
Forest Preserve District of DuPage County, Law Enforcement Department
Forest Preserve District of Kane County, Public Safety Department
Lake County Forest Preserve District, Public Safety Department, aka Ranger Police Department
McHenry County Conservation District Police, Law enforcement for forest preserves in McHenry County
Forest Preserve District of Will County, Police Department

Other county departments

Cook County State's Attorneys Office, Investigations Unit
Cook County Health and Hospitals System Police Department
McHenry County Conservation Police Department
Vermilion County Conservation Police Department

Municipal agencies

Abingdon Police Department
Addison Police Department
Albany Police Department
Albers Police Department
Albion Police Department
Aledo Police Department
Alexis Police Department
Algonquin Police Department
Alma Police Department
Alorton Police Department
Alpha Police Department
Alsip Police Department
Altamont Police Department
Alton Police Department
Altona Police Department
Alvin Police Department
Amboy Police Department
Andalusia Police Department
Anna Police Department
Annawan Police Department
Antioch Police Department
Apple River Police Department
Arcola Police Department
Argenta Police Department
Arlington Heights Police Department
Armington Police Department
Aroma Park Police Department ^{[citation needed]}
Arthur Police Department ^{[citation needed]}
Ashkum Police Department ^{[citation needed]}
Ashland Police Department
Ashley Police Department
Ashton Police Department
Assumption Police Department
Astoria Police Department
Athens Police Department
Atkinson Police Department
Atlanta Police Department
Atwood Police Department
Auburn Police Department
Augusta Police Department
Aurora Police Department
Ava Police Department
Aviston Police Department
Avon Police Department
Baldwin Police Department
Bannockburn Police Department
Barrington Police Department
Barrington Hills Police Department
Barrington-Inverness Police Department
Barry Police Department
Bartlett Police Department
Bartonville Police Department
Batavia Police Department
Bath Police Department
Baylis Police Department
Bayview Gardens Police Department
Beardstown Police Department
Beckemeyer Police Department
Bedford Park Police Department
Beecher Police Department
Belgium Police Department
Belleville Police Department
Bellflower Police Department
Bellwood Police Department
Belvidere Police Department
Bement Police Department
Benld Police Department
Bensenville Police Department
Benton Police Department
Berkeley Police Department
Berwyn Police Department
Bethalto Police Department
Bethany Police Department
Blandinsville Police Department
Bloomingdale Police Department
Bloomington Police Department
Blue Island Police Department
Blue Mound Police Department
Bluffs Police Department
Bolingbrook Police Department
Bonnie Police Department
Bourbonnais Police Department
Bradford Police Department
Bradley Police Department
Braidwood Police Department
Breese Police Department
Bridgeport Police Department
Bridgeview Police Department
Brighton Police Department
Broadview Police Department
Brocton Police Department
Brookfield Police Department
Brooklyn Police Department
Brookport Police Department
Brownstown Police Department
Buckner Police Department
Buda Police Department
Buffalo Grove Police Department
Buffalo-Mechanicsburg Police Department
Bull Valley Police Department
Buncombe Police Department
Bunker Hill Police Department
Burbank Police Department
Bureau Police Department
Burnham Police Department
Burr Ridge Police Department
Bushnell Police Department
Byron Police Department
Cahokia Police Department
Cairo Police Department
Calumet City Police Department
Calumet Park Police Department
Cambria Police Department
Camp Point Police Department
Campton Hills Police Department
Canton Police Department
Carbondale Police Department
Carlinville Police Department
Carlyle Police Department
Carmi Police Department
Carol Stream Police Department
Carpentersville Police Department
Carrier Mills Police Department
Carrollton Police Department
Carterville Police Department
Carthage Police Department
Cary Police Department
Casey Police Department
Caseyville Police Department
Catlin Police Department
Cave-In-Park Police Department
Cedar Point Police Department
Cedarville Police Department
Central City Police Department
Centralia Police Department
Centreville Police Department
Cerro Gordo Police Department
Chadwick Police Department
Champaign Police Department ^[8]
Chandlerville Police Department^{[citation needed]}
Channahon Police Department^{[citation needed]}
Chapin Police Department^{[citation needed]}
Charleston Police Department
Chatham Police Department
Chebanse Police Department
Chenoa Police Department
Cherry Police Department
Cherry Valley Police Department
Chester Police Department
Chesterfield Police Department
Chicago Heights Police Department
Chicago Police Department
Chicago Ridge Police Department
Chillicothe Police Department
Chrisman Police Department
Christopher Police Department
Cicero Police Department
Cissna Park Police Department
Clarendon Hills Police Department
Clayton Police Department
Clinton Police Department
Coal City Police Department
Coal Valley Police Department
Cobden Police Department
Coffeen Police Department
Colchester Police Department
Colfax Police Department
Collinsville Police Department
Colona Police Department
Columbia Police Department
Cordova Police Department
Cortland Police Department
Coulterville Police Department
Country Club Hills Police Department
Countryside Police Department
Cowden Police Department
Crainsville Police Department
Creal Springs Police Department
Crest Hill Police Department
Crestwood Police Department
Crete Police Department
Creve Coeur Police Department
Crossville Police Department
Crystal Lake Police Department
Cuba Police Department
Cutler Police Department
Cypress Police Department
Dallas City Police Department
Dalzell Police Department
Dana Police Department
Danvers Police Department
Danville Police Department
Darien Police Department
De Pue Police Department
Decatur Police Department
Deer Creek-Goodfield Police Department
Deerfield Police Department
Dekalb Police Department
Delavan Police Department
DePue Police Department
Des Plaines Police Department
DeSoto Police Department
Divernon Police Department
Dixmoor Police Department
Dixon Police Department
Dolton Police Department
Dongola Police Department
Donnellson Police Department
Dowell Police Department
Downers Grove Police Department
Downs Police Department
Du Quoin Police Department
Dunfermline Police Department
Dupo Police Department
Durand Police Department
Dwight Police Department
Earlville Police Department
East Alton Police Department
East Carondelet Police Department
East Dubuque Police Department
East Dundee Police Department
East Galesburg Police Department
East Hazel Crest Police Department
East Moline Police Department
East Peoria Police Department
East St Louis Police Department
Easton Police Department
Edinburg Police Department
Edwardsville Police Department
Effingham Police Department
El Paso Police Department
Elburn Police Department
Eldorado Police Department
Elgin Police Department
Elizabeth Police Department
Elk Grove Village Police Department
Elkhart Police Department
Elkville Police Department
Ellis Grove Police Department
Elmhurst Police Department
Elmwood Police Department
Elmwood Park Police Department
Elsah Police Department
Elwood Police Department
Emden Police Department
Energy Police Department
Enfield Police Department
Erie Police Department
Eureka Police Department
Evanston Police Department
Evansville Police Department
Evergreen Park Police Department
Ewing Police Department
Fairbury Police Department
Fairfield Police Department
Fairmont City Police Department
Fairmount Police Department
Fairview Heights Police Department
Fairview Police Department
Farina Police Department
Farmer City Police Department
Farmington Police Department
Fayetteville Police Department
Fillmore Police Department
Findlay Police Department
Fisher Police Department
Fithian Police Department
Flora Police Department
Flossmoor Police Department
Forest City Police Department
Forest Park Police Department
Forest View Police Department
Fox Lake Police Department
Fox River Grove Police Department
Frankfort Police Department
Franklin Grove Police Department
Franklin Park Police Department
Freeburg Police Department
Freeport Police Department
Fulton Police Department
Galatia Police Department
Galena Police Department
Galesburg Police Department
Galva Police Department
Gardner Police Department
Geneseo Police Department
Geneva Police Department
Genoa Police Department
Georgetown Police Department
German Valley Police Department
Gibson City Police Department
Gillespie Police Department
Gilman Police Department
Girard Police Department
Gladstone Police Department
Glasford Police Department
Glen Carbon Police Department
Glen Ellyn Police Department
Glencoe Department of Public Safety
Glendale Heights Police Department
Glenview Police Department
Glenwood Police Department
Golconda Police Department
Golf Police Department
Goreville Police Department
Grafton Police Department
Grandview Police Department
Granite City Police Department
Granville Police Department
Grant Park Police Department
Grayslake Police Department
Grayville Police Department
Great Lakes Police Department
Green Valley Police Department
Greenfield Police Department
Greenup Police Department
Greenview Police Department
Greenville Police Department
Gridley Police Department
Griggsville Police Department
Gulfport Police Department
Gurnee Police Department
Hamel Police Department
Hamilton Police Department
Hampshire Police Department
Hampton Police Department
Hanover Park Police Department
Hanover Police Department
Hardin Police Department
Harrisburg Police Department
Hartford Police Department
Harvard Police Department
Harvel Police Department
Harvey Police Department
Harwood Heights Police Department
Havana Police Department
Hawthorn Woods Police Department
Hazel Crest Police Department
Hebron Police Department
Hennepin Police Department
Henry Police Department
Herrin Police Department
Herscher Police Department
Heyworth Police Department
Hickory Hills Police Department
Highland Park Police Department
Highland Police Department
Highwood Police Department
Hillcrest Police Department
Hillsboro Police Department
Hillside Police Department
Hinckley Police Department
Hinsdale Police Department
Hodgkins Police Department
Hoffman Estates Police Department
Hometown Police Department
Homewood Police Department
Hoopeston Police Department
Hopedale Police Department
Hudson Police Department
Huntley Police Department
Hurst Police Department
Illiopolis Police Department
India Head Park Police Department
Inverness Police Department
Irvington Police Department
Island Lake Police Department
Itasca Police Department
Jacksonville Police Department
Jerome Police Department
Jerseyville Police Department
Johnsburg Police Department
Johnston City Police Department
Joliet Police Department
Jonesboro Police Department
Justice Police Department
Kankakee Police Department
Kansas Police Department
Karnak Police Department
Keithsburg Police Department
Kenilworth Police Department
Kewanee Police Department
Kildeer Police Department
Kincaid Police Department
Kingston Police Department
Kinmundy Police Department
Kirkland Police Department
Knoxville Police Department
La Grange Park Police Department
La Grange Police Department
La Harpe Police Department
La Salle Police Department
Lacon Police Department
Ladd Police Department
Lake Bluff Police Department
Lake Forest Police Department
Lake in the Hills Police Department
Lake Zurich Police Department
Lakemoor Police Department
LaMoille Police Department
Lanark Police Department
Lansing Police Department
Lawrenceville Police Department
Lebanon Police Department
Leland Police Department
Lemont Police Department
Lena Police Department
Lenzburg Police Department
LeRoy Police Department
Lewistown Police Department
Lexington Police Department
Libertyville Police Department
Lincoln Police Department
Lincolnshire Police Department
Lincolnwood Police Department
Lindenhurst Police Department
Lisle Police Department
Litchfield Police Department
Livingston Police Department
Lockport Police Department
Lomax Police Department
Lombard Police Department
Loves Park Police Department
Lovington Police Department
Ludlow Police Department
Lyndon Police Department
Lynwood Police Department
Lyons Police Department
Mackinaw Police Department
Macomb Police Department
Madison Police Department
Mahomet Police Department
Malta Police Department
Manhattan Police Department
Manito Police Department
Mansfield Police Department
Manteno Police Department
Marengo Police Department
Marion Police Department
Marissa Police Department
Markham Police Department
Maroa Police Department
Marseilles Police Department
Marshall Police Department
Martinsville Police Department
Maryville Police Department
Mascoutah Police Department
Mason City Police Department
Matteson Police Department
Mattoon Police Department
Maywood Police Department
McCook Police Department
McCullom Lake Police Department
McHenry Police Department
McLeansboro Police Department
Melrose Park Police Department
Mendota Police Department
Meredosia Police Department
Merrionette Park Police Department
Metamora Police Department
Metropolis Police Department
Midlothian Police Department ^{[citation needed]}
Milan Police Department ^{[citation needed]}
Milford Police Department ^{[citation needed]}
Milledgeville Police Department
Millstadt Police Department
Minier-Armington Police Department
Minonk Police Department
Minooka Police Department
Mokena Police Department
Moline Police Department
Momence Police Department
Monee Police Department
Montgomery Police Department
Monticello Police Department
Morris Police Department
Morrison Police Department
Morrisonville Police Department
Morton Grove Police Department
Morton Police Department
Mound City Police Department
Mounds Police Department
Mount Carmel Police Department
Mount Carroll Police Department
Mount Morris Police Department
Mount Olive Police Department
Mount Prospect Police Department
Mount Pulaski Police Department
Mount Sterling Police Department
Mount Vernon Police Department
Mount Zion Police Department
Moweaqua Police Department
Mundelein Police Department
Murphysboro Police Department
Naperville Police Department
Nashville Police Department
Nauvoo Police Department
Neoga Police Department
Neponset Police Department
New Athens Police Department
New Baden Police Department
New Berlin Police Department
New Lenox Police Department
Newman Police Department
Newton Police Department
Niles Police Department
Nokomis Police Department
Normal Police Department
Norridge Police Department
Norris City Police Department
North Aurora Police Department
North Chicago Police Department
North Pekin Police Department
North Riverside Police Department
Northbrook Police Department
Northfield Police Department
Northlake Police Department
Oak Brook Police Department
Oak Forest Police Department
Oak Lawn Police Department
Oak Park Police Department
Oakbrook Terrace Police Department
Oakland Police Department
Oakwood Hills Police Department
Oakwood Police Department
Oblong Police Department
Odin Police Department
O'Fallon Police Department
Oglesby Police Department
Okawville Police Department
Olney Police Department
Olympia Fields Police Department
Onarga Police Department
Oquawka Police Department
Oregon Police Department
Orland Hills Police Department
Orland Park Police Department
Oswego Police Department
Ottawa Police Department
Palatine Police Department
Palestine Police Department
Palos Heights Police Department
Palos Hills Police Department
Palos Park Police Department
Pana Police Department
Paris Police Department
Park City Police Department
Park Forest Police Department
Park Ridge Police Department
Patoka Police Department
Pawnee Police Department
Paxton Police Department
Payson Police Department
Pearl City Police Department
Pecatonica Police Department
Pekin Police Department
Peoria Heights Police Department
Peoria Police Department
Peotone Police Department
Peru Police Department
Petersburg Police Department
Phoenix Police Department
Pinckneyville Police Department
Pingree Grove Police Department
Piper City Police Department
Pittsfield Police Department
Plainfield Police Department
Plano Police Department
Pleasant Hill Police Department
Pleasant Plains Police Department
Polo Police Department
Pontiac Police Department
Pontoon Beach Police Department
Port Byron Police Department
Posen Police Department
Prairie Grove Police Department
Princeton Police Department
Prophetstown Police Department
Prospect Heights Police Department
Quincy Police Department
Rantoul Police Department
Raymond Police Department
Red Bud Police Department
Richmond Police Department
Richton Park Police Department
Ridge Farm Police Department
Ridgway Police Department
River Forest Police Department
River Grove Police Department
Riverdale Police Department
Riverside Police Department
Riverton Police Department
Riverwoods Police Department
Robbins Police Department
Robinson Police Department
Rochelle Police Department
Rochester Police Department
Rock Falls Police Department
Rock Island Police Department
Rockford Police Department
Rockton Police Department
Rolling Meadows Police Department
Romeoville Police Department
Roodhouse Police Department
Roscoe Police Department
Roselle Police Department
Rosemont Police Department
Rosiclare Police Department
Rossville Police Department
Round Lake Beach Police Department
Round Lake Heights Police Department
Round Lake Park-Hainesville Police Department
Round Lake Police Department
Roxana Police Department
Royal Lakes Police Department
Royalton Police Department
Rushville Police Department
Salem Police Department
San Jose Police Department
Sandoval Police Department
Sandwich Police Department
Sauget Police Department
Sauk Village Police Department
Savanna Police Department
Schaumburg Police Department
Schiller Park Police Department
Seneca Police Department
Sesser Police Department
Shannon Police Department
Shawneetown Police Department
Sheffield Police Department
Shelbyville Police Department
Sherman Police Department
Sherrard Police Department
Shiloh Police Department
Shipman Police Department
Shorewood Police Department
Silvis Police Department
Skokie Police Department
Sleepy Hollow Police Department
Smithton Police Department
Somonauk Police Department
South Beloit Police Department
South Elgin Police Department
South Holland Police Department
South Jacksonville Police Department
South Roxana Police Department
Sparta Police Department
Spring Valley Police Department
Springfield Police Department
St. Charles Police Department
St. Elmo Police Department
St. Peter Police Department
Staunton Police Department
Steeleville Police Department
Steger Police Department
Sterling Police Department
Stickney Police Department
Stockton Police Department
Stone Park Police Department
Streamwood Police Department
Streator Police Department
Sugar Grove Police Department
Sullivan Police Department
Summerfield Police Department
Summit Police Department
Sumner Police Department
Swansea Police Department
Sycamore Police Department
Tampico Police Department
Taylorville Police Department
Teutopolis Police Department
Thomasboro Police Department
Thomson Police Department
Thornton Police Department
Tilton Police Department
Tinley Park Police Department
Tiskilwa Police Department
Toledo Police Department
Tolono Police Department
Toluca Police Department
Toulon Police Department
Tower Lakes Police Department
Tremont Police Department
Trenton Police Department
Troy Police Department
Tuscola Police Department
Ullin Police Department
University Park Police Department
Urbana Police Department
Utica Police Department
Valmeyer Police Department
Vandalia Police Department
Venice Police Department
Vernon Hills Police Department
Vienna Police Department
Villa Grove Police Department
Villa Park Police Department
Viola Police Department
Virden Police Department
Virginia Police Department
Walnut Police Department
Wamac Police Department
Warren Police Department
Warrensburg Police Department
Warrenville Police Department
Washburn Police Department
Washington Park Police Department
Washington Police Department
Waterloo Police Department
Waterman Police Department
Watseka Police Department
Wauconda Police Department
Waukegan Police Department
Waverly Police Department
Wayne Police Department
Wenona Police Department
West Chicago Police Department
West Dundee Police Department
West Frankfort Police Department
West Salem Police Department
Westchester Police Department
Western Springs Police Department
Westmont Police Department
Westville Police Department
Wheaton Police Department
Wheeling Police Department
White Hall Police Department
Williamson Police Department
Willow Springs Police Department
Willowbrook Police Department
Wilmette Police Department
Wilmington Police Department
Wilsonville Police Department
Windsor Police Department
Winfield Police Department
Winnebago Police Department
Winnetka Police Department
Winthrop Harbor Police Department
Witt Police Department
Wood Dale Police Department
Wood River Police Department
Woodhull Police Department
Woodridge Police Department
Woodstock Police Department
Worden Police Department
Worth Police Department
Wyanet Police Department
Wyoming Police Department
Xenia Police Department
Yorkville Police Department
Zeigler Police Department
Zion Police Department

Special district agencies

Park district police agencies

Canton Park District Police Department
Crystal Lake Park District Police Department
Decatur Park District Police Department
East St Louis Park District Police Department
Fondulac Park District Police Department
Fox Valley Park District Police Department
Hawthorne Park District Police Department
Lockport Township Park District Police Department
Morton Grove Park District Police Department
Naperville Park District Police Department
Pekin Park District Police Department
Peoria Park District Police Department
Rockford Park District Police Department
Springfield Park District Police Department
Zion Park District Police Department

Other special district agencies

Abraham Lincoln Capital Airport Police Department
Chicago Zoological Society Police Department
Effingham Water Authority Police Department
Metra Police Department
Metropolitan Airport Authority of Rock Island County Public Safety
Metropolitan Water Reclamation District of Greater Chicago Police Department (formerly Chicago Sanitary District Police Department)
Northern Indiana Commuter Transportation District Police

College and university agencies

Aurora University Campus Public Safety Department
Augustana College Police Department
Bradley University Police Department
Chicago State University Police Department
Eastern Illinois University Police Department
Eureka College Police Department
Governors State University Police Department
Illinois State University Police Department
Lewis University Police Department
Loyola University Chicago Department of Campus Safety
McKendree University Public Safety
Millikin University Campus Police Department
Moody Bible Institute Department of Public Safety
North Central College Department of Public Safety
Northeastern Illinois University Police Department
Northern Illinois University Police Department
Northwestern University Police Department
Rockford University Department of Police and Public Safety
Saint Xavier University Department of Public Safety
Southern Illinois University Carbondale Police Department
Southern Illinois University Edwardsville Police Department
Southern Illinois University School of Medicine Office of Police and Security
University of Chicago Police Department
University of Illinois at Chicago Police Department
University of Illinois at Springfield Police Department
University of Illinois at Urbana-Champaign Police Department
Western Illinois University - Office of Public Safety

Community or junior college agencies

Black Hawk College Police Department
City College of Chicago Campus Police Department
College of DuPage Police Department
College of Lake County Police Department
Elgin Community College Police Department
Harper College Police Department
Illinois Central College Campus Police Department
John A. Logan College Police Department
John Wood Community College Police Department
Joliet Junior College Police Department
Kankakee Community College Police Department
Kaskaskia College Police Department
Lake Land College Police Department
Lincoln Land Community College Police Department
McHenry County College Police Department
Moraine Valley Community College Police Department
Morton College Police Department
Oakton Community College Police Department
Parkland College Police Department
Rend Lake College Police Department
Rock Valley College Police Department
South Suburban College Police Department
Southwestern Illinois College Police Department
Triton College Police Department
Waubonsee Community College Police Department

Railroad police departments

Ag Valley Railroad Police Department
Alton & Southern Railway Police Department
Amtrak Police Department
Belt Railway Police Department
Burlington Northern and Santa Fe Railroad Police Department
Canadian National Railway Police
Canadian Pacific Railway Police Service
CSX Transportation Police Department
Norfolk Southern Railway Police Department
Terminal Railroad Police Department
Union Pacific Railroad Police Department

Disbanded/Defunct agencies

Benedictine University Police Department Lisle Campus (Switched to public safety department)
Benedictine University Police Department Springfield Campus (Campus closed)
Chicago Department of Aviation Police Department^[9]^[10]
Chicago Housing Authority Police Department
Chicago Park District Police Department^[11]
Chicago Transit Authority Police Department ^{[citation needed]}
Clyde Park District Police Department ^{[citation needed]}
Dixmoor Park District Police Department
Ford Heights Police Department
Forest Park Park District Police Department ^{[citation needed]}
Illinois Department of Central Management Services Police ^{[citation needed]}
Illinois Department of Mental Health Police ^{[citation needed]}
Lombard Park District Police Department
London Mills Police Department
Maywood Park District Police Department
Memorial Park District Police Department
Cook County's Oak Forest Hospital Department of Public Safety
Peoria Public Schools Campus Police Department
Round Lake Area Park District Police Department
Markham Park District Police Department
East Chicago Heights Police Department was renamed Ford Heights Police Department before being disbanded as stated above.
The Park Forest South Police Department changed their name to University Park Police Department.
Thornton Community College Police Department is currently named South Suburban Community College Police Department.
Westfield Police Department

References

^ 2018 Census of State and Local Law Enforcement Agencies, by Andrea M. Gardner and Kevin M. Scott, Ph.D., US Department of Justice, Office of Justice Programs, Bureau of Justice Statistics, October 2022
^ https://www.champaigncountyil.gov ^{[bare URL]}
^ "Sheriff | Effingham County, GA".
^ https://iroquoiscountyil.gov/ ^{[bare URL]}
^ https://kankakeecountysheriff.com/ ^{[bare URL]}
^ https://www.madisoncountyil.gov/ ^{[bare URL]}
^ https://www.peoriacounty.gov/ ^{[bare URL]}
^ "Police Department". Champaign,Illinois. Retrieved 29 December 2018.
^ Goudie, Chuck (12 July 2017). "Chicago aviation police decertified by state". ABC7 Chicago.
^ Goudie, Chuck (25 April 2017). "Chicago aviation police quietly being rebranded". ABC7 Chicago.
^ "Chicago Park District Police Department, Illinois, Fallen Officers".

[1] 2018 Census of State and Local Law Enforcement Agencies, by Andrea M. Gardner and Kevin M. Scott, Ph.D., US Department of Justice, Office of Justice Programs, Bureau of Justice Statistics, October 2022

[2] ttps://www.champaigncountyil.gov ^{[bare URL]}

[3] "Sheriff | Effingham County, GA".

[4] ttps://iroquoiscountyil.gov/ ^{[bare URL]}

[5] ttps://kankakeecountysheriff.com/ ^{[bare URL]}

[6] ttps://www.madisoncountyil.gov/ ^{[bare URL]}

[7] ttps://www.peoriacounty.gov/ ^{[bare URL]}

[8] "Police Department". Champaign,Illinois. Retrieved 29 December 2018.

[9] Goudie, Chuck (12 July 2017). "Chicago aviation police decertified by state". ABC7 Chicago.

[10] Goudie, Chuck (25 April 2017). "Chicago aviation police quietly being rebranded". ABC7 Chicago.

[11] "Chicago Park District Police Department, Illinois, Fallen Officers".

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