400px|miniatyr|Illinois countyn. Detta är en lista över de 102 countyn som finns i delstaten Illinois i USA.National Association of Counties - Find a county
County Centralort (County Seat)Adams CountyQuincyAlexander CountyCairoBond CountyGreenvilleBoone CountyBelvidereBrown CountyMount SterlingBureau CountyPrincetonCalhoun CountyHardinCarroll CountyMount CarrollCass CountyVirginiaChampaign CountyUrbanaChristian CountyTaylorvilleClark CountyMarshallClay CountyLouisvilleClinton CountyCarlyleColes CountyCharlestonCook CountyChicagoCrawford CountyRobinsonCumberland CountyToledoDeKalb CountyClintonDeWitt CountySycamoreDouglas CountyTuscolaDuPage CountyWheatonEdgar CountyParisEdwards CountyAlbionEffingham CountyEffinghamFayette CountyVandaliaFord CountyPaxtonFranklin CountyBentonFulton CountyLewistownGallatin CountyShawneetownGreene CountyCarrolltonGrundy CountyMorrisHamilton CountyMcLeansboroHancock CountyCarthageHardin CountyElizabethtownHenderson CountyOquawkaHenry CountyCambridgeIroquois CountyWatsekaJackson CountyMurphysboroJasper CountyNewtonJefferson CountyMount VernonJersey CountyJerseyvilleJo Daviess CountyGalenaJohnson CountyViennaKane CountyGenevaKankakee CountyKankakeeKendall CountyYorkvilleKnox CountyGalesburgLake CountyWaukeganLaSalle CountyOttawaLawrence CountyLawrencevilleLee CountyDixonLivingston CountyPontiacLogan CountyLincolnMacon CountyDecaturMacoupin CountyCarlinvilleMadison CountyEdwardsvilleMarion CountySalemMarshall CountyLaconMason CountyHavanaMassac CountyMetropolisMcDonough CountyMacombMcHenry CountyWoodstockMcLean CountyBloomingtonMenard CountyPetersburgMercer CountyAledoMonroe CountyWaterlooMontgomery CountyHillsboroMorgan CountyJacksonvilleMoultrie CountySullivanOgle CountyOregonPeoria CountyPeoriaPerry CountyPinckneyvillePiatt CountyMonticelloPike CountyPittsfieldPope CountyGolcondaPulaski CountyMound CityPutnam CountyHennepinRandolph CountyChesterRichland CountyOlneyRock Island CountyRock IslandSaline CountyHarrisburgSangamon CountySpringfieldSchuyler CountyRushvilleScott CountyWinchesterShelby CountyShelbyvilleSt. Clair CountyBellevilleStark CountyToulonStephenson CountyFreeportTazewell CountyPekinUnion CountyJonesboroVermilion CountyDanvilleWabash CountyMount CarmelWarren CountyMonmouthWashington CountyNashvilleWayne CountyFairfieldWhite CountyCarmiWhiteside CountyMorrisonWill CountyJolietWilliamson CountyMarionWinnebago CountyRockfordWoodford CountyEureka
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Illinois countyn Illinois countyn