C
- C&r CommunicationsYorkville, IL
- Cabworks Custom Elevators IncChicago, IL
- Cahokia Vol. Fire DepartmentCahokia, IL
- Campbell, GaryManito, IL
- Canadian NationalHomewood, IL
- Capital Industrial Coatings LlcHomewood, IL
- Capitol Construction Solutions IncPlainfield, IL
- Capulli, Michael CChicago, IL
- Carbondale, City OFCarbondale, IL
- Carey's Heating And A/c IncTinley Park, IL
- Carl Sandburg CollegeGalesburg, IL
- Carle Foundation HospitalUrbana, IL
- Carmean Electric of HarrisburgHarrisburg, IL
- Carmi Municipal AirportCarmi, IL
- Carmi, City OFCarmi, IL
- Carnes CommunicationsPittsfield, IL
- Carroll, Dana LGarden Prairie, IL
- Case Foundation CompanyRoselle, IL
- Cass Cable TVVirginia, IL
- Catholic Bishop of ChicagoChicago, IL
- Cattaneo Electric CompanyDarien, IL
- CB Recovery Group IncSchaumburg, IL
- Cbi Engineering Contractor LlcPlainfield, IL
- Cbi Services, LlcPlainfield, IL
- Ccaonline, Inc.Lincoln, IL
- Cdw Government LlcVernon Hills, IL
- Cedar Rapids Cellular Telephone, L.p.Chicago, IL
- Celebrate Communications, LlcMoline, IL
- Cellular Properties, Inc.Danville, IL
- Centel Cellular Company OF PeoriaChicago, IL
- Centel Cellular Company OF Texas Limited PartnershipChicago, IL
- Central IL Regional Dispatch CenterDecatur, IL
- Central Illinois Public Service COSpringfield, IL
- Central States Communication Service IncDanville, IL
- Central States Holding, LlcWheaton, IL
- Central States TowerPalatine, IL
- Central States Tower Holdings, LlcWheaton, IL
- Central States Tower Ii, LlcWheaton, IL
- Central States Tower Iii, LlcWheaton, IL
- Central States Tower V, LlcWheaton, IL
- Central States Tower, LlcWheaton, IL
- Centralia Radio Communications IncCentralia, IL
- Cfm/vr-tesco LlcElgin, IL
- Cgn & Associates, Inc.Peoria, IL
- Chamberlain, Rickie JRamsey, IL
- Chamlin & Associates IncPeru, IL
- Champaign Multimedia Group, LlcChampaign, IL
- Chatham BeepersChicago, IL
- Chicago Apartment LP Dba = New York ApartmentsChicago, IL
- Chicago Audio Works, Inc.Chicago, IL
- Chicago Communications LlcElmhurst, IL
- Chicago Comnet Corporation Dba = Greater Chicago Videopath IncMC Cook, IL
- Chicago Electrical Services, Inc.Chicago, IL
- Chicago Equipment Company IncCarol Stream, IL
- Chicago Flyhouse IncorporatedChicago, IL
- Chicago Mercantile Exchange 20 South Wacker Drive Chicago, IL 60606Chicago, IL
- Chicago Mercantile Exchange IncChicago, IL
- Chicago Mercantile Inc 20 South Wacker Drive Chicago, IL 60606Chicago, IL
- Chicago Office Technology Group, Inc.Bolingbrook, IL
- Chicago Sound Factory, Inc.Chicago, IL
- Chicago Tower Leasing CorpPark Ridge, IL
- Chicago Transit AuthorityChicago, IL
- Chicago, Central & Pacific Railroad CompanyHomewood, IL
- Chicago, City OFChicago, IL
- Childers, Wayne EAthens, IL
- Chinuge, David WEast Peoria, IL
- Christianson Roofing A Tecta America Company LlcRosemont, IL
- Cicero, Town OFFranklin Park, IL
- Cirdc (central Illinois Regional Dispatch Center)Decatur, IL
- City of Aurora IllinoisAurora, IL
- City OF Belleville Police DeptBelleville, IL
- City OF ChicagoChicago, IL
- City Of Chicago OemcChicago, IL
- City of Chicago Office of Emergency Management And CommunicationsChicago, IL
- City of Chicago Office of Emergency Management CommunicationsChicago, IL
- City OF Columbia IllinoisColumbia, IL
- City of Crest HillCrest Hill, IL
- City of Darien, ILDarien, IL
- City of DekalbDekalb, IL
- City of Dekalb Dekalb ILDekalb, IL
- City of Dekalb Police DepartmentDekalb, IL
- City of FreeportFreeport, IL
- City of GalesburgGalesburg, IL
- City of GibsonGibson City, IL
- City of HighlandHighland, IL
- City of Mendota E-911Mendota, IL
- City of MetropolisMetropolis, IL
- City OF Metropolis Metropolis Municipal AirportMetropolis, IL
- City of MilanMilan, IL
- City of Milan Police DepartmentMilan, IL
- City Of MonmouthMonmouth, IL
- City OF MorrisMorris, IL
- City OF MT CarmelMT Carmel, IL
- City of NapervilleNaperville, IL
- City of O'fallonO'fallon, IL
- City of Park Ridge, IllinoisPark Ridge, IL
- City of PeoriaPeoria, IL
- City of Peoria, ILPeoria, IL
- City OF Peru Illinois Valley Regional AirportPeru, IL
- City OF PittsfieldPittsfield, IL