| RMRocky Mountain Redi Mix Plt No3 | Rifle | CO | — | ◇ UNVERIFIED |
| RMRocky Mount Ready Mix Concrete INC | Rocky Mount | VA | — | ◇ UNVERIFIED |
| RRRoessler Ready Mix INC | Columbia | IL | — | ◇ UNVERIFIED |
| RRRogers Ready Mix | Sparta | IL | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials | Durand | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials | Byron | IL | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials INC | Oregon | IL | — | ◇ UNVERIFIED |
| RRRogers Ready Mix & Materials INC | Roscoe | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rockford | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Byron | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rochelle | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rochelle | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix | Ruma | IL | — | ◇ UNVERIFIED |
| RRRoger's Redi-mix INC | New Athens | IL | — | ◇ UNVERIFIED |
| RRRoger's Redi-mix INC | Valmeyer | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Steeleville | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Waterloo | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Chester | IL | — | ◇ UNVERIFIED |
| RLRollcon Llc, Onsite Plant | Clinton | MS | — | ◇ UNVERIFIED |
| RRRoscoe Ready - Mix INC | Pecatonica | IL | — | ◇ UNVERIFIED |
| RRRoscoe Ready-mix INC | Belvidere | IL | — | ◇ UNVERIFIED |
| RCRosebud Concrete INC | Mission | SD | — | ◇ UNVERIFIED |
| RRRosenbalm Rockery | Fresno | CA | — | ◇ UNVERIFIED |
| RRRosenbalm Rockery | Madera | CA | — | ◇ UNVERIFIED |
| RCRosenfeld Concrete CORP | Framingham | MA | — | ◇ UNVERIFIED |
| RCRosenfeld Concrete CORP | Hopedale | MA | — | ◇ UNVERIFIED |
| RCRoseville-cemey Construction Materials,llc | Roseville | CA | — | ◇ UNVERIFIED |
| RIRoss Island Boise Concrete Plant | Portland | OR | — | ◇ UNVERIFIED |
| RIRoss Island Hardtack Island Plant | Portland | OR | — | ◇ UNVERIFIED |
| RIRoss Island Sand and Gravel Tait Facility | Portland | OR | — | ◇ UNVERIFIED |
| RIRoss Island Sand & Gravel CO | Portland | OR | — | ◇ UNVERIFIED |
| RRRost Ready Mix | Springfield | MO | — | ◇ UNVERIFIED |
| RRRost Ready Mix | Springfield | MO | — | ◇ UNVERIFIED |
| RRRoswell Ready Mix Concrete | Roswell | NM | — | ◇ UNVERIFIED |
| RCRouland Concrete and Supplies | Jacksonville | IL | — | ◇ UNVERIFIED |
| RRRound Rock Batch Plant | — | TX | — | ◇ UNVERIFIED |
| RCRowe Construction CO | Normal | IL | — | ◇ UNVERIFIED |
| RCRowe Construction CO - Plant 150 | Bloomington | IL | — | ◇ UNVERIFIED |
| RCRowe Construction Co-plant 170 | Bloomington | IL | — | ◇ UNVERIFIED |
| RMRowe Materials - Spotsylvania Plant | Fredericksburg | VA | — | ◇ UNVERIFIED |
| RRRowley Ready Mix, Inc. | Gloucester | MA | — | ◇ UNVERIFIED |
| RNRoxboro - Nc Rmc | Roxboro | NC | — | ◇ UNVERIFIED |
| RWRoyal White Cement | Houston | TX | — | ◇ UNVERIFIED |
| RRR R Beasley Incorporated - Kilmarnock | Kilmarnock | VA | — | ◇ UNVERIFIED |
| RSR & S Concrete | Fresno | TX | — | ◇ UNVERIFIED |
| RRR&t Redi Mix - 7355 Colorado 196 | Lamar 3.3 Mi. N of | CO | — | ◇ UNVERIFIED |
| RRRuach Resources LLC - Portable Wash Plant I | Tioga | ND | — | ◇ UNVERIFIED |
| RRRuach Resources LLC - Williston Ready Mix Plant | Williston | ND | — | ◇ UNVERIFIED |
| RBRubble Bee Recycling | Stafford | VA | — | ◇ UNVERIFIED |
| RCRuiz Concrete & Paving INC Dba Ruiz Engineering INC | Long Beach | CA | — | ◇ UNVERIFIED |