| OPOmega Products International | Sacramento | — | ◇ UNVERIFIED |
| OROrosi Rock LLC | Orosi | — | ◇ UNVERIFIED |
| OMOutback Materials | Friant | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass Container INC | Antioch | — | ◇ UNVERIFIED |
| PBPabco Building Products (f#4070) | Sacramento | — | ◇ UNVERIFIED |
| PBPalmdale Batch Plant | Palmdale | — | ◇ UNVERIFIED |
| PTPalomar Transit Mix CO | Escondido | — | ◇ UNVERIFIED |
| PRParadise Ready Mix | Paradise | — | ◇ UNVERIFIED |
| PPParamount Precast Design INC | Sun Valley | — | ◇ UNVERIFIED |
| PRParamount Ready Mix Concrete Plant 23 | Paramount | — | ◇ UNVERIFIED |
| PWPavestone - Winters, Ca Plant | Winters | — | ◇ UNVERIFIED |
| PCPhilips Components Discrete P | Los Angeles | — | ◇ UNVERIFIED |
| PNPilkington North America Incorporated | Lathrop | — | ◇ UNVERIFIED |
| PPPiranha Pipe and Precast | Chowchilla | — | ◇ UNVERIFIED |
| PCPrecast Concrete Technologies Unlimited LLC | Olivehurst | — | ◇ UNVERIFIED |
| PSPulp Studio INC | Gardena | — | ◇ UNVERIFIED |
| QCQuikrete - City of Industry, Ca Plant | La Puente | — | ◇ UNVERIFIED |
| QPQuikrete - Porterville, Ca Plant | Porterville | — | ◇ UNVERIFIED |
| QSQuikrete - Sacramento, Ca Plant | Sacramento | — | ◇ UNVERIFIED |
| QSQuikrete - San Diego, Ca Plant | San Diego | — | ◇ UNVERIFIED |
| QSQuikrete - Sun Valley, Ca Plant | Sun Valley | — | ◇ UNVERIFIED |
| RMReady Mix Gardena Plant 25 | Rosewood | — | ◇ UNVERIFIED |
| RMReady-mix Moreno Valley Plant 2 | Moreno Valley | — | ◇ UNVERIFIED |
| RPResco Products INC | Santa Fe Spgs | — | ◇ UNVERIFIED |
| RCRialto Concrete Products INC | Rialto | — | ◇ UNVERIFIED |
| RRRich Readimix Concrete INC | Greenbrae | — | ◇ UNVERIFIED |
| RPRmc Pacific Materials (dba Cemex) | Davenport | — | ◇ UNVERIFIED |
| RPRmc Pacific Materials Incorporated | San Jose | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | Corona | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | Corona | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | French Camp | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | Beaumont | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix Lake Forest Plant 18 | Foothill Ranch | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix San Bernardino Plant 12 | San Bernardino | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix Santa Ana Plant 17 | Santa Ana | — | ◇ UNVERIFIED |
| RRRobertsons Rialto Batch and Rock Plant | Rialto | — | ◇ UNVERIFIED |
| SCSaint-gobain Containers | Los Angeles | — | ◇ UNVERIFIED |
| SCSaint-gobain Containers LLC | El Monte | — | ◇ UNVERIFIED |
| SFSan Francisco (a) | San Francisco | — | ◇ UNVERIFIED |
| SCSannipoli CORP | Menifee | — | ◇ UNVERIFIED |
| SCSelvage Concrete Products, INC | Santa Rosa | — | ◇ UNVERIFIED |
| SRService Rock Products | Barstow | — | ◇ UNVERIFIED |
| SCSilicon Crystals, INC. | Rancho Cordova | — | ◇ UNVERIFIED |
| SRSoiland Resources LLC | Windsor | — | ◇ UNVERIFIED |
| SRSpragues' Rock and Sand CO | Simi Valley | — | ◇ UNVERIFIED |
| SCStandard Concrete Products INC | Santa Monica | — | ◇ UNVERIFIED |
| SWStanley Works Chatsworth Facility | Chatsworth | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Fairfield | — | ◇ UNVERIFIED |
| SSSunnyvale School Dist | Sunnyvale | — | ◇ UNVERIFIED |
| SGSunyeah Group Corporation | Ontario | — | ◇ UNVERIFIED |
