| HPHanover Park Village of | Hanover Park | — | ◇ UNVERIFIED |
| HMHanson Material Service Yd 46 | Algonquin | — | ◇ UNVERIFIED |
| HFHarbor Foods | Winthrop Harbor | — | ◇ UNVERIFIED |
| HOHathaway One Stop | Harrisburg | — | ◇ UNVERIFIED |
| HMHeartland Memorial Center | Frankfort | — | ◇ UNVERIFIED |
| HCHeaventree Candle CO | Wheeling | — | ◇ UNVERIFIED |
| HPHeidner Property Management | Buffalo Grove | — | ◇ UNVERIFIED |
| HFHeritage Fs-gibson City | Gibson City | — | ◇ UNVERIFIED |
| HCHess Carl | Freeport | — | ◇ UNVERIFIED |
| HSHickory Shores Resort | Carlyle | — | ◇ UNVERIFIED |
| HSHighland Supply CORP | Highland | — | ◇ UNVERIFIED |
| HTHohn's Tank Wash | Danville | — | ◇ UNVERIFIED |
| HRHollenbaugh Residence | Loves Park | — | ◇ UNVERIFIED |
| HSHolly Sorey | Fisher | — | ◇ UNVERIFIED |
| HTHolthaus Truck Services INC | Beckemeyer | — | ◇ UNVERIFIED |
| HTHp Tuners LLC | Buffalo Grove | — | ◇ UNVERIFIED |
| HEHypermax Engineering | Gilberts | — | ◇ UNVERIFIED |
| IIIcd Ironhorse INC | Monticello | — | ◇ UNVERIFIED |
| IIIcon Identity Solutions | Elk Grove Village | — | ◇ UNVERIFIED |
| IGIdeal Gerit Drum Ring Mfg | Bedford Park | — | ◇ UNVERIFIED |
| ITIdeal Troy CO | Peoria | — | ◇ UNVERIFIED |
| IIIfco Ics-chicago INC | Lockport | — | ◇ UNVERIFIED |
| IBIl Bell Telephone CO Dba At&t Illinois | Chicago | — | ◇ UNVERIFIED |
| IBIl Bell Telephone CO Dba At&t Illinois | Chicago | — | ◇ UNVERIFIED |
| IIIllico INC | Centralia | — | ◇ UNVERIFIED |
| IWIllinois-american Water CO | Alton | — | ◇ UNVERIFIED |
| IWIllinois-american Water Company San Koty Facility | Peoria | — | ◇ UNVERIFIED |
| IBIllinois Bulk Carriers | Chicago Heights | — | ◇ UNVERIFIED |
| ITIllinois Tire Recycling INC | Cicero | — | ◇ UNVERIFIED |
| IPIncon Process Systems LLC | Saint Charles | — | ◇ UNVERIFIED |
| IHIndiana Harbor Belt | Franklin Park | — | ◇ UNVERIFIED |
| IRIndiana Recycling & Renewable Fuels LLC | Chicago Heights | — | ◇ UNVERIFIED |
| IJIngenco Joliet Facility | Joliet | — | ◇ UNVERIFIED |
| IHIntermet Havana Foundry | Havana | — | ◇ UNVERIFIED |
| IWIronwood West Subdivision | Champaign | — | ◇ UNVERIFIED |
| JIJabco Industrial Services | Yorkville | — | ◇ UNVERIFIED |
| JAJ & a Cartage | Palatine | — | ◇ UNVERIFIED |
| JIJayvir INC | Litchfield | — | ◇ UNVERIFIED |
| JWJd Weber Grain Storage & Drying | Osco | — | ◇ UNVERIFIED |
| JJimax | Peoria | — | ◇ UNVERIFIED |
| JJJ & J One Hour Cleaners INC | Bensenville | — | ◇ UNVERIFIED |
| JVJks Ventures INC | Melrose Park | — | ◇ UNVERIFIED |
 Johns Manville - Waukegan | Waukegan | — | ◇ UNVERIFIED |
| JPJohnson-pate Pork | Dekalb | — | ◇ UNVERIFIED |
| JMJoliet Mi LLC | Joliet | — | ◇ UNVERIFIED |
| JYJoliet Youth Center-dept of Corrections | Joliet | — | ◇ UNVERIFIED |
| JHJoseph H. Warner and Gerald E. Warner | Paxton | — | ◇ UNVERIFIED |
| JMJoseph M. Trautman | Champaign | — | ◇ UNVERIFIED |
| J1Joy's 1 Hour Cleaners | Lake Zurich | — | ◇ UNVERIFIED |
| JMJp Morgan Chase | Chicago | — | ◇ UNVERIFIED |
