| RRRiver Redi Mix INC | Ransom | — | ◇ UNVERIFIED |
| RERjf Enterprises, INC. | Mounds | — | ◇ UNVERIFIED |
| RLR & L Ready Mix Concrete INC | Robinson | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Roanoke | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Eureka | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Lincoln | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | East Peoria | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products CO | Galesburg | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products INC | Toluca | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products INC | Mossville | — | ◇ UNVERIFIED |
| RCRoanoke Concrete Products INC | Normal | — | ◇ UNVERIFIED |
| RRRock River Lumber & Grain CO | Prophetstown | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials | Durand | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials INC | Roscoe | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials INC | Oregon | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Byron | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rochelle | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rochelle | — | ◇ UNVERIFIED |
| RRRoger's Redi-mix INC | New Athens | — | ◇ UNVERIFIED |
| RRRoger's Redi-mix INC | Valmeyer | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Chester | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Steeleville | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Waterloo | — | ◇ UNVERIFIED |
| RRRoscoe Ready-mix INC | Belvidere | — | ◇ UNVERIFIED |
| RCRowe Construction CO | Normal | — | ◇ UNVERIFIED |
| RCRowe Construction CO - Plant 150 | Bloomington | — | ◇ UNVERIFIED |
| RCRowe Construction Co-plant 170 | Bloomington | — | ◇ UNVERIFIED |
| RRRrv Renovations, LLC | Machesney Park | — | ◇ UNVERIFIED |
| RIRub-r-tek INC | Olney | — | ◇ UNVERIFIED |
| SCSchirz Concrete Products INC | Greenfield | — | ◇ UNVERIFIED |
| SCSesser Concrete Products CO | Sesser | — | ◇ UNVERIFIED |
| SSSilvia Statuary | Chicago | — | ◇ UNVERIFIED |
| SASjostrom and Sons INC | South Beloit | — | ◇ UNVERIFIED |
| SJS Jostrom & Sons INC | Oregon | — | ◇ UNVERIFIED |
| SSSjostrom & Sons INC | Rockford | — | ◇ UNVERIFIED |
| SSSjostrom & Sons INC | Rockford | — | ◇ UNVERIFIED |
| SCSkyway Cement CO LLC | Chicago | — | ◇ UNVERIFIED |
| SGSmith Garden Center & Landscaping INC. | Macomb | — | ◇ UNVERIFIED |
| SRSport Redi-mix LLC | Rantoul | — | ◇ UNVERIFIED |
| SRSport Redi-mix LLC | Tilton | — | ◇ UNVERIFIED |
| SRSport Redi-mix LLC | Ogden | — | ◇ UNVERIFIED |
| SRSport Redi-mix LLC | Goodfield | — | ◇ UNVERIFIED |
| SCSpringfield Concrete Recycling LLC | Springfield | — | ◇ UNVERIFIED |
| SRStahl Ready-mixed Concrete | Wyoming | — | ◇ UNVERIFIED |
| SCStaley Consolidated Ready Mix INC | Pekin | — | ◇ UNVERIFIED |
| SEStark Excavating INC | Bloomington | — | ◇ UNVERIFIED |
| SEStark Excavating INC | Normal | — | ◇ UNVERIFIED |
| SMStark Materials INC | Normal | — | ◇ UNVERIFIED |
| SGStar-Tech Glass, Inc. | Chicago | — | ◇ UNVERIFIED |
| SRSterling-rockfalls Ready Mix | Dixon | — | ◇ UNVERIFIED |