Counties in Illinois
102 counties on record with at least one law enforcement agency in Illinois.
No county-level crime rate or population figure appears here. A sheriff’s office and the city police departments inside its county serve overlapping populations, so summing officers or residents across a county double-counts people covered by more than one agency. These pages list agencies only.
Adams4 agenciesAlexander2 agenciesBond6 agenciesBoone4 agenciesBrown2 agenciesBureau12 agenciesCalhoun2 agenciesCarroll8 agenciesCass5 agenciesChampaign11 agenciesChristian9 agenciesClark4 agenciesClay2 agenciesClinton12 agenciesColes5 agenciesCook159 agenciesCrawford5 agenciesCumberland4 agenciesDekalb13 agenciesDewitt3 agenciesDouglas7 agenciesDupage40 agenciesEdgar4 agenciesEdwards4 agenciesEffingham4 agenciesFayette5 agenciesFord3 agenciesFranklin8 agenciesFulton7 agenciesGallatin4 agenciesGreene5 agenciesGrundy11 agenciesHamilton2 agenciesHancock6 agenciesHardin1 agencyHenderson5 agenciesHenry13 agenciesIroquois6 agenciesJackson6 agenciesJasper2 agenciesJefferson4 agenciesJersey4 agenciesJo Daviess8 agenciesJohnson3 agenciesKane30 agenciesKankakee11 agenciesKendall10 agenciesKnox5 agenciesLa Salle18 agenciesLake42 agenciesLawrence5 agenciesLee4 agenciesLivingston5 agenciesLogan5 agenciesMacon10 agenciesMacoupin10 agenciesMadison29 agenciesMarion8 agenciesMarshall4 agenciesMason7 agenciesMassac3 agenciesMcdonough6 agenciesMchenry30 agenciesMclean14 agenciesMenard4 agenciesMercer5 agenciesMonroe4 agenciesMontgomery10 agenciesMorgan6 agenciesMoultrie5 agenciesOgle8 agenciesPeoria9 agenciesPerry4 agenciesPiatt5 agenciesPike2 agenciesPope1 agencyPulaski3 agenciesPutnam2 agenciesRandolph9 agenciesRichland2 agenciesRock Island9 agenciesSaline4 agenciesSangamon26 agenciesSchuyler2 agenciesScott3 agenciesShelby6 agenciesSt Clair30 agenciesStark4 agenciesStephenson5 agenciesTazewell20 agenciesUnion5 agenciesVermilion16 agenciesWabash2 agenciesWarren4 agenciesWashington6 agenciesWayne3 agenciesWhite5 agenciesWhiteside9 agenciesWill41 agenciesWilliamson9 agenciesWinnebago15 agenciesWoodford8 agencies