| GRGorman Ready Mix CO INC | Jerseyville | — | ◇ UNVERIFIED |
| GCGp Concrete | Pontiac | — | ◇ UNVERIFIED |
| GCGraber Concrete Pipe Company | Bloomingdale | — | ◇ UNVERIFIED |
| GBGrandioso Brick & Stone | Chicago | — | ◇ UNVERIFIED |
| GMGranite Marble Gallery | Mundelein | — | ◇ UNVERIFIED |
| GEGranit Expert, Inc. | Wheeling | — | ◇ UNVERIFIED |
| GRGranville Ready Mix | Granville | — | ◇ UNVERIFIED |
| GDGreenlee Diamond Tool CO | Des Plaines | — | ◇ UNVERIFIED |
| GCGrexii CORP D/b/a Block Ready Mix Group | Silvis | — | ◇ UNVERIFIED |
| GAGrier Abrasive Operating LLC | South Holland | — | ◇ UNVERIFIED |
| GPGrier Products Inc. | South Holland | — | ◇ UNVERIFIED |
| GCGrundy County Redi-mix CO | Morris | — | ◇ UNVERIFIED |
| GRGrundy Redi Mix CO | Coal City | — | ◇ UNVERIFIED |
 Hahn Ready Mix CO | Aledo | — | ◇ UNVERIFIED |
| HRHardin Ready Mix INC | Hardin | — | ◇ UNVERIFIED |
| HIHardroc INC. | Wheeling | — | ◇ UNVERIFIED |
| HKHarry Kuhn INC | Plainfield | — | ◇ UNVERIFIED |
| HCHarsco Corporation | Pawnee | — | ◇ UNVERIFIED |
| HCHarvest Custom Countertops | West Chicago | — | ◇ UNVERIFIED |
| HBHayward Baker | Gillespie | — | ◇ UNVERIFIED |
| HCHoward Concrete Pumping CO INC | Belleville | — | ◇ UNVERIFIED |
| IBIbc Block Mfg LLC | Champaign | — | ◇ UNVERIFIED |
| ICIcci Concrete LLC | Tremont | — | ◇ UNVERIFIED |
| ILIc Lights, LLC | Nokomis | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix | Roseville | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC | Little York | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC | Dallas City | — | ◇ UNVERIFIED |
| IRIdeal Ready Mix CO INC | Stronghurst | — | ◇ UNVERIFIED |
| IRIllini Ready Mix INC | Carbondale | — | ◇ UNVERIFIED |
| IGIllinois Granite and Marble LTD. | Elk Grove Village | — | ◇ UNVERIFIED |
| IMIllinois Mining CORP | Romeoville | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Bloomington | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Bloomington | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Peoria | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Monticello | — | ◇ UNVERIFIED |
| IVIllinois Valley Paving CO | Jacksonville | — | ◇ UNVERIFIED |
 Indian Industries INC D/b/a US Weight | Olney | — | ◇ UNVERIFIED |
| ITInnovative Technology & Materials INC | Chicago | — | ◇ UNVERIFIED |
| ICIpsen Ceramics | Pecatonica | — | ◇ UNVERIFIED |
| IMIrving Materials INC | Lawrenceville | — | ◇ UNVERIFIED |
| JCJames Cape & Sons CO | Rochelle | — | ◇ UNVERIFIED |
| JCJames Cape & Sons -illinois | Addison | — | ◇ UNVERIFIED |
| JCJames Cape & Sons-illinois | Chicago | — | ◇ UNVERIFIED |
| JCJames Cape & Sons-illinois | Barrington | — | ◇ UNVERIFIED |
| JCJ Curry Ready Mix of Rushville INC | Astoria | — | ◇ UNVERIFIED |
| JCJ. Curry Redi-mix of Rushville, INC. | Rushville | — | ◇ UNVERIFIED |
| JMJennchem Midwest, LLC | Macedonia | — | ◇ UNVERIFIED |
| JTJ.e. Tomes & Associates, INC. | Blue Island | — | ◇ UNVERIFIED |
| JPJet Precast, INC. | O'fallon | — | ◇ UNVERIFIED |
| JCjhz cement llc | Sterling | — | ◇ UNVERIFIED |
