| CPClark Pacific | Fontana | — | ◇ UNVERIFIED |
| CPClark Pacific Adelanto Precast Plant | Adelanto | — | ◇ UNVERIFIED |
| CMCorona Millworks INC | Chino | — | ◇ UNVERIFIED |
| COCounty of San Bernardino Pmd - J.t. | Trona | — | ◇ UNVERIFIED |
| CSCreative Stone Mfg,. INC. | Fontana | — | ◇ UNVERIFIED |
| CSCreative Stone Mfg INC Dba Coronado Stone Products | Rialto | — | ◇ UNVERIFIED |
| CSCreative Stone Mfg, INC Dba Coronado Stone Products | Fontana | — | ◇ UNVERIFIED |
| DJDaryl J. Buck | Fontana | — | ◇ UNVERIFIED |
| DMDennie Manning Concrete, INC. | Fontana | — | ◇ UNVERIFIED |
| DSDr Scott Martin | Barstow | — | ◇ UNVERIFIED |
| DADura Art Stone Construction CO INC | Mentone | — | ◇ UNVERIFIED |
| DADura Art Stone INC | Fontana | — | ◇ UNVERIFIED |
| ESElementis Specialties INC | Newberry Springs | — | ◇ UNVERIFIED |
| ECExpress Contractors INC | Fontana | — | ◇ UNVERIFIED |
| EMEz Mix Company INC | Rialto | — | ◇ UNVERIFIED |
| FSFourth Street Rock Crusher | San Bernardino | — | ◇ UNVERIFIED |
| GSGonsalves & Santucci INC Dba Conco | Fontana | — | ◇ UNVERIFIED |
| HLHavasu Landing Concrete | Lavasu Lake | — | ◇ UNVERIFIED |
| HBHeitman Brooks Ii, LLC. | Ontario | — | ◇ UNVERIFIED |
| HMHi-grade Materials-bear Valley Rd | Hesperia | — | ◇ UNVERIFIED |
| HMHi-grade Materials Company - Yucca Valley | Yucca Valley | — | ◇ UNVERIFIED |
| HMHi-grade Materials-two Mile Rd | Joshua Tree | — | ◇ UNVERIFIED |
| HRHolliday Rock Co., INC | Upland | — | ◇ UNVERIFIED |
| HTHolliday Trucking, INC | San Bernardino | — | ◇ UNVERIFIED |
| HTHovey Tile Art | Mentone | — | ◇ UNVERIFIED |
| IVInland Valley Recovery | Upland | — | ◇ UNVERIFIED |
| ISInterior Specialists INC | Ontario | — | ◇ UNVERIFIED |
| JCJeffrey Court INC | Fontana | — | ◇ UNVERIFIED |
 Jensen Enterprises INC Dba Jensen Precast | Ontario | — | ◇ UNVERIFIED |
| JPJensen Precast | Fontana | — | ◇ UNVERIFIED |
| JVJesse Villarreal | Ontario | — | ◇ UNVERIFIED |
| JBJohnson Bateman CO Inc/ a Calif CORP | Ontario | — | ◇ UNVERIFIED |
| JCJohnson-bateman Company | Ontario | — | ◇ UNVERIFIED |
| JTJohn T Provines LTD INC Dba Vj Memorial Vj Industries | Chino | — | ◇ UNVERIFIED |
| KIKti INC Dba Rialto Concrete Products | Rialto | — | ◇ UNVERIFIED |
| LMLa Mirada Rockport | Upland | — | ◇ UNVERIFIED |
| LCLargo Concrete | Colton | — | ◇ UNVERIFIED |
| LTLast Tenant | Fontana | — | ◇ UNVERIFIED |
| MMMarian Michael | Apple Valley | — | ◇ UNVERIFIED |
 Mitsubishi Cement Corporation Cushenbury Plant | Lucerne Valley | — | ◇ UNVERIFIED |
| MIModerustic INC | Rancho Cucamonga | — | ◇ UNVERIFIED |
| MLMonier Lifetile | Rialto | — | ◇ UNVERIFIED |
| MLMonierlifetile LLC | San Bernardino | — | ◇ UNVERIFIED |
| NSNewman & Sons INC. | Bloomington | — | ◇ UNVERIFIED |
| NANorth American Recycling & Crushing, LLC. | Colton | — | ◇ UNVERIFIED |
| OAOldcastle Apg West/dba Superlite Block | Needles | — | ◇ UNVERIFIED |
 Oldcastle Infrastructure, INC - Fontana | Fontana | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Fontana | — | ◇ UNVERIFIED |
| OBOrco Blended Products INC | Highland | — | ◇ UNVERIFIED |
| PAPacific Aggregates | Colton | — | ◇ UNVERIFIED |
