| CCalchemist | Half Moon Bay | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| CCCalifornia Casting | Richmond | CA | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| CECalifornia Electric Steel | Angels Camp | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CICalifornia Industrial Rubber Company | Yuba City | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| CPCalifornia Pipe Fabricators | Dixon | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CPCalifornia Pipe Recycling, INC. | Bakersfield | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CSCal Strip Industries INC | Cty of Cmmrce | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| CSCalstrip Steel CORP | Los Angeles | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSCamblin Steel INC | Oakland | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CSCamblin Steel INC | Coarsegold | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CMCamco Machine INC | Fontana | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CMCarlsbad Machining | Carlsbad | CA | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| CCCarter Casting CO INC | South Gate | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CMCasara Modern | Huntington Beach | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| CCastco | San Leandro | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CICastheon INC | Newbury Park | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CPCast Products Dba Consolidated Precision Products | Pomona | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CUCertex USA LLC | Wilmington | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CFCharter Foundry CO INC | Huntington Park | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| COCity of Ontario | Ontario | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CPClamp-swing Pricing CO INC | Oakland | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CSClay Smith Engineering INC | Buena Park | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CVClow Valve Company | Corona | CA | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| CMCoastal Manufacturing | Watsonville | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| CACoast Aluminum | Hayward | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| CCCoastcast CORP | Rancho Dominguez | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CICoastcast INC | Gardena | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CFCoast Fndy | La Verne | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| CICoast Industrial Supply CO INC | Cerritos | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CMCoast Metals Exchange INC. | Montclair | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| CACombo Aluminum Products | Redlands | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| CECommercial Enameling CO | Huntington Park | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CMCommercial Metals Company | Etiwanda | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| CACommonwealth Aluminum Concast | Carson | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CECompton Enterprises | Chico | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CPConsolidated Precision Products | Port Hueneme | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CHConstruction Hotline and Management Partners, INC. | Santa Ana | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CMCoronado Manufacturing LLC | Sun Valley | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CWCove West Four Slide & Stamping CORP | Fullerton | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CPCpp - Pomona | Pomona | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CSCraftsmen Steel Buildings | Spring Valley | CA | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| CSCrest Steel | Jurupa Valley | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CLCr Laurence - Union City | Union City | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| CHCsr Hydro Conduit | Corona | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CBCustom Bilt Metals LLC | Whittier | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| CMCustom Machined Products | Escondido | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
 Dameron Alloy Foundries INC | Compton | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| DWDan's Wire Mfg, INC | Fremont | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| DHDavid H. Fell & Co, INC | Burlingame | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| DWDavis Wire CORP Dba Viking Wire LLC | Mira Loma | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
