| PMPrairie Materials Sales-#3 | La Grange | — | ◇ UNVERIFIED |
| PMPrairie Materials Sales-plant 10 | Batavia | — | ◇ UNVERIFIED |
| PMPrairie Materials Sales-plt 4 | South Holland | — | ◇ UNVERIFIED |
| PBPresnell Bros INC | Coalton | — | ◇ UNVERIFIED |
| PEPrestress Engineering CO | Blackstone | — | ◇ UNVERIFIED |
| QCQuad County Ready Mix | Carlyle | — | ◇ UNVERIFIED |
| QCQuad County Ready Mix | Nashville | — | ◇ UNVERIFIED |
| QCQuad County Ready Mix | Centralia | — | ◇ UNVERIFIED |
| QRQuad-county Ready Mix | Okawville | — | ◇ UNVERIFIED |
| QRQuality Ready Mix Concrete CO | Sterling | — | ◇ UNVERIFIED |
| QRQuincy Ready Mix INC | Quincy | — | ◇ UNVERIFIED |
| RMReady Mix Solutions LLC | Anna | — | ◇ UNVERIFIED |
| RERed E Mix LLC | Litchfield | — | ◇ UNVERIFIED |
| RERed E Mix LLC | Jerseyville | — | ◇ UNVERIFIED |
| RCRegal China CORP | Antioch | — | ◇ UNVERIFIED |
| RIRegal Industrial LLC | Pekin | — | ◇ UNVERIFIED |
| RRRegional Ready Mix LLC | Rochelle | — | ◇ UNVERIFIED |
| RVRex Vault & Mausoleum Service INC | Newton | — | ◇ UNVERIFIED |
| RRRiver Redi-mix INC | Minonk | — | ◇ UNVERIFIED |
| RGRiverstone Group INC | Rock Island | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Bloomington | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Petersburg | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Lincoln | — | ◇ UNVERIFIED |
| RCRockford Cement Products CO | Rockford | — | ◇ UNVERIFIED |
| RCRock-tred CORP | Skokie | — | ◇ UNVERIFIED |
| RRRoessler Ready Mix INC | Columbia | — | ◇ UNVERIFIED |
| RRRogers Ready Mix | Sparta | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials | Byron | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rockford | — | ◇ UNVERIFIED |
| RRRoscoe Ready - Mix INC | Pecatonica | — | ◇ UNVERIFIED |
| RCRouland Concrete and Supplies | Jacksonville | — | ◇ UNVERIFIED |
| SSSchrey Systems INC | Newton | — | ◇ UNVERIFIED |
| SASelee Advanced Ceramics | Gilberts | — | ◇ UNVERIFIED |
| SSSheridan Sand & Gravel | Chicago | — | ◇ UNVERIFIED |
| SBSilver Bros INC | Hoopeston | — | ◇ UNVERIFIED |
| SCSouth Chicago Property Development | Chicago | — | ◇ UNVERIFIED |
| SOSpancrete of Illinois | Crystal Lake | — | ◇ UNVERIFIED |
| SCStaley Concrete CO INC | Champaign | 1–19 | ◇ UNVERIFIED |
| SIStaleys Interstate Ready-mix Concrete | Peoria | — | ◇ UNVERIFIED |
| SSStark Services INC | Marengo | — | ◇ UNVERIFIED |
| SMSt Marys Cement INC | Waukegan | — | ◇ UNVERIFIED |
| SMSt Marys Cement INC - Dixon Plant | Dixon | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | — | ◇ UNVERIFIED |
| SGSuperior Graphite CO | Bedford Park | — | ◇ UNVERIFIED |
| SMSuper Mix Concrete LLC | Volo | — | ◇ UNVERIFIED |
| SMSuper Mix INC | Marengo | — | ◇ UNVERIFIED |
| SBSwansea Building Products CORP | East Saint Louis | — | ◇ UNVERIFIED |
| SCSzentes Concrete | Peoria | — | ◇ UNVERIFIED |
| TGTemperbent Glass LP | Alsip | — | ◇ UNVERIFIED |