| ABAngelus Block Company | Oxnard | — | ◇ UNVERIFIED |
| AIAnnieglass INC | Watsonville | — | ◇ UNVERIFIED |
| ALArdex LP | Stockton | — | ◇ UNVERIFIED |
| ARAssociated Ready Mixed Concrete | San Diego | — | ◇ UNVERIFIED |
| ABAtkinson Brick CO | Perris | — | ◇ UNVERIFIED |
| ABAtkinson Brick Company | Los Angeles | — | ◇ UNVERIFIED |
| AGAvalon Glass & Mirror CO | Carson | — | ◇ UNVERIFIED |
| BRBender Ready Mix INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| BRBerkeley Ready Mix Concrete | Berkeley | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Turlock | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Tracy | — | ◇ UNVERIFIED |
| CMCalaveras Materials INC | Lathrop | — | ◇ UNVERIFIED |
| CSCalifornia State University at Los Angeles | Los Angeles | — | ◇ UNVERIFIED |
| CCCalstone Company | San Martin | — | ◇ UNVERIFIED |
| CSCal St Univ Northridge | Northridge | — | ◇ UNVERIFIED |
| CCCardinal Cg | Galt | — | ◇ UNVERIFIED |
| CCCardinal Cg | Moreno Valley | — | ◇ UNVERIFIED |
| CCCastaic Clay Manufacturing Company Incorporated | Castaic | — | ◇ UNVERIFIED |
| CPCatalina Pacific Concrete CO Sun Valley Plant | Sun Valley | — | ◇ UNVERIFIED |
| CPCatalinia Pacific Concrete CO San Juan Plant | San Juan Capistrano | — | ◇ UNVERIFIED |
| CCementpro | Ontario | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Amador Plant | San Francisco | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Bakersfield | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Farmersville | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Merced | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Bell | — | ◇ UNVERIFIED |
| CFCemex Friant | Friant | — | ◇ UNVERIFIED |
| CMCemex Moorpark Plant | Moorpark | — | ◇ UNVERIFIED |
| CPCemex Pleasanton | Pleasanton | — | ◇ UNVERIFIED |
| CCCentral Concrete Supply - a US Concrete Company | Hayward | — | ◇ UNVERIFIED |
| CICeradyne INC 3m Company | Irvine | — | ◇ UNVERIFIED |
| CVChristy Vault Company Tulare | Tulare | — | ◇ UNVERIFIED |
| CPClean Planet, INC. | Stockton | — | ◇ UNVERIFIED |
| CLClear Lake Lava Dba Williams Redi Mix INC. | Williams | — | ◇ UNVERIFIED |
| CMColombo Mine | Sierra City | — | ◇ UNVERIFIED |
| CVCordeiro Vault CO INC | Elk Grove | — | ◇ UNVERIFIED |
| DCDeleo Clay Tile CO INC | Lake Elsinore | — | ◇ UNVERIFIED |
| DDuracite | Fairfield | — | ◇ UNVERIFIED |
| ECEast County Ready Mix & Materials CORP. | El Cajon | 1–19 | ◇ UNVERIFIED |
| ERElite Ready Mix LLC | Sacramento | — | ◇ UNVERIFIED |
| ERElite Ready Mix LLC | Pleasant Grove | — | ◇ UNVERIFIED |
| FRFarrow Ready Mix | Santa Rosa | — | ◇ UNVERIFIED |
| FNFlorence & New Italian Art Company | Hayward | — | ◇ UNVERIFIED |
 Freeman Rock INC. | Crescent City | — | ◇ UNVERIFIED |
| FCFtg Construction Materials INC | Antioch | — | ◇ UNVERIFIED |
| GCGainey Ceramics INC | La Verne | — | ◇ UNVERIFIED |
| GRGalt Rock and Asphalt Products | Galt | — | ◇ UNVERIFIED |
| GGGarner Glass | Claremont | — | ◇ UNVERIFIED |
| GIGuardian Industries CORP | Fullerton | — | ◇ UNVERIFIED |
| HAHanson Aggregates Mid-pacific INC | San Luis Obispo | — | ◇ UNVERIFIED |
