| RRRobertson's Ready Mix - Palmdale | Palmdale | CA | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix Plant 40 | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix - Victorville | Victorville | CA | — | ◇ UNVERIFIED |
| RVRoberts Vault Company, INC. | Dade City | FL | — | ◇ UNVERIFIED |
| RPRobstown Plant | Robstown | TX | — | ◇ UNVERIFIED |
| RSRockbridge Stone Products | Glasgow | VA | — | ◇ UNVERIFIED |
| RRRockcastle Ready Mix | Mount Vernon | KY | — | ◇ UNVERIFIED |
| RCRockdale Cbp | Rockdale | TX | — | ◇ UNVERIFIED |
| RHRock Hill Concrete LLC | Dayton | WA | — | ◇ UNVERIFIED |
| RRRockingham Redi-mix - Boyd Tavern Facility | Troy | VA | — | ◇ UNVERIFIED |
| RRRockingham Redi-mix - Charlottesville Facility | Charlottesville | VA | — | ◇ UNVERIFIED |
| RRRockingham Redi-mix - Clearbrook Facility | Stephenson | VA | — | ◇ UNVERIFIED |
| RRRockingham Redi-mix - Front Royal Facility | Front Royal | VA | — | ◇ UNVERIFIED |
| RRRockingham Redi-mix - Pulaski Facility | Pulaski | VA | — | ◇ UNVERIFIED |
| RRRock River Lumber & Grain CO | Prophetstown | IL | — | ◇ UNVERIFIED |
| RSRock Solid INC. | Chandler | AZ | — | ◇ UNVERIFIED |
| RSRock Solid INC. | Mesa | AZ | — | ◇ UNVERIFIED |
| RSRock Solid INC - Queen Creek Plant | San Tan Valley | AZ | — | ◇ UNVERIFIED |
| RCRock-tred CORP | Skokie | IL | — | ◇ UNVERIFIED |
| RFRockville Fuel and Feed | Rockville | MD | — | ◇ UNVERIFIED |
| RMRocky Mountain Precast, LLC | Yigo | GU | — | ◇ UNVERIFIED |
| RMRocky Mountain Premix - Wabash Plant | Colorado Springs | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Prestress | Greeley | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Prestress LLC (structural Plant) | Denver | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Ready Mix Concrete INC | Denver | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Redi-mix | Eagle | CO | — | ◇ UNVERIFIED |
| RMRocky Mountain Redi Mix Plt No3 | Rifle | CO | — | ◇ UNVERIFIED |
| RMRocky Mount Ready Mix Concrete INC | Rocky Mount | VA | — | ◇ UNVERIFIED |
| RMRocky Mt Prestressed | Sheridan | CO | — | ◇ UNVERIFIED |
| RCRocla Concrete Tie Incorporated | Denver | CO | — | ◇ 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 | Byron | IL | — | ◇ UNVERIFIED |
| RRRogers Ready-mix & Materials INC | Rockford | 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 | Chester | IL | — | ◇ UNVERIFIED |
| RRRogers Redi-mix INC | Waterloo | IL | — | ◇ UNVERIFIED |
| RORohn Ornamental Concrete INC | Bethlehem | PA | — | ◇ 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 | Madera | CA | — | ◇ UNVERIFIED |
| RRRosenbalm Rockery | Fresno | CA | — | ◇ UNVERIFIED |
| RCRosenfeld Concrete CORP | Hopedale | MA | — | ◇ UNVERIFIED |
| RCRosenfeld Concrete CORP | Framingham | MA | — | ◇ UNVERIFIED |
| RCRoseville-cemey Construction Materials,llc | Roseville | CA | — | ◇ UNVERIFIED |
| RCRoseville Crushed Concrete | Roseville | MI | — | ◇ UNVERIFIED |
| RIRoss Island Boise Concrete 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 |
| RRR & R Garden Supply, INC. | Medley | FL | — | ◇ 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 |
| RCRuby Concrete Company INC | Madisonville | KY | — | ◇ UNVERIFIED |
| RCRuiz Concrete & Paving INC Dba Ruiz Engineering INC | Long Beach | CA | — | ◇ UNVERIFIED |
| RHRulon Harper Construction, INC. Pit No. 6 | Salt Lake County | UT | — | ◇ UNVERIFIED |
| RHRulon Harper Construction Pit #12 | Tooele | UT | — | ◇ UNVERIFIED |
| RBRussell Block Co., INC. | Russell | KS | — | ◇ UNVERIFIED |
| RRRussell Ready Mix Concrete, INC. | Russell | KS | — | ◇ UNVERIFIED |
| RVRustin Vault & Monument Co., INC. | Chipley | FL | — | ◇ UNVERIFIED |
| RCRvier City Redemix | Salmon | ID | — | ◇ UNVERIFIED |
| RBRw Busse Excavating | Grand Lake | CO | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Slippery Rock | PA | — | ◇ UNVERIFIED |
| RSR.w. Sidley, INC. | Youngwood | PA | — | ◇ UNVERIFIED |
| SPSabine Pass Cbp | Port Arthur | TX | — | ◇ UNVERIFIED |
| SPSabine Pass Lng LP - Sabine Pass Lng Import Terminal | Johnsons Bayou | LA | — | ◇ UNVERIFIED |
| SPSabine Pass Washout Facility | Port Arthur | TX | — | ◇ UNVERIFIED |
| SPSacramento Prestige Gunite | Rocklin | CA | — | ◇ UNVERIFIED |
| SSSacramento Stucco | West Sacramento | CA | — | ◇ UNVERIFIED |
| SHSaint Henry Tile CO INC Dba Berne Ready Mix | Berne | IN | — | ◇ UNVERIFIED |
| SPSalem Plant | Salem | MO | — | ◇ UNVERIFIED |
| SRSalem Ready Mix, LLC | Salem | SD | — | ◇ UNVERIFIED |
| SCSalina Concrete Products | Salina | KS | — | ◇ UNVERIFIED |
| SCSalinas Concrete | Deming | NM | — | ◇ UNVERIFIED |