| CSCoast Sheet Metal, INC. | Huntington Beach | — | ◇ UNVERIFIED |
| CECobra Engineering INC | Yorba Linda | — | ◇ UNVERIFIED |
| CHC.O.I. Holdings | Newport Coast | — | ◇ UNVERIFIED |
| CAConcrete Accessories | Fullerton | — | ◇ UNVERIFIED |
| CMConnelly Machine Works INC Dba Acme Tool Grinding | Santa Ana | — | ◇ UNVERIFIED |
| CHConstr Hot Line & Mgmt Partners INC Dba Champ Stee | Santa Ana | — | ◇ UNVERIFIED |
| CIContract Illumination, INC | Orange | — | ◇ UNVERIFIED |
| CCControl Components INC | Rancho Santa Margari | — | ◇ UNVERIFIED |
| CFCpc Fabrication INC | Santa Ana | — | ◇ UNVERIFIED |
| CICppg, INC. | Anaheim | — | ◇ UNVERIFIED |
| CMCreative Metals INC Dba Ashworth Metal Products | Anaheim | — | ◇ UNVERIFIED |
| CMCresco Manufacturing INC | Anaheim | — | ◇ UNVERIFIED |
| CSCundiff Steel Fab & Erecting | Orange | — | ◇ UNVERIFIED |
| CSCundiff Steel Fabricating & Erecting INC | Orange | — | ◇ UNVERIFIED |
| CTCurry Tool CO INC | Costa Mesa | — | ◇ UNVERIFIED |
| CECustom Enamelers INC | Fountain Valley | — | ◇ UNVERIFIED |
| CPCvk & P, LLC | Fullerton | — | ◇ UNVERIFIED |
| DSDaily Saw Service | Fullerton | — | ◇ UNVERIFIED |
| DCDana Creath Designs INC | Costa Mesa | — | ◇ UNVERIFIED |
| DDanco | Santa Ana | — | ◇ UNVERIFIED |
| DAData Aire INC | Orange | — | ◇ UNVERIFIED |
| DEDb Enterprises | Fountain Valley | — | ◇ UNVERIFIED |
| DED & E Precision Sheet Metal in | Anaheim | — | ◇ UNVERIFIED |
| DIDerlan INC | Santa Ana | — | ◇ UNVERIFIED |
| DPDesai Precision Duburring INC | Santa Ana | — | ◇ UNVERIFIED |
| DBDiamond B, INC. | Cypress | — | ◇ UNVERIFIED |
| DSDieter Stefanon and Karin Nelson-Stefanon | Orange | — | ◇ UNVERIFIED |
| DDDig Dog LLC | Costa Mesa | — | ◇ UNVERIFIED |
| DDDig Dog LLC | Costa Mesa | — | ◇ UNVERIFIED |
| DMDimension Machinery Company, LLC | Fullerton | — | ◇ UNVERIFIED |
| DMDlong Medtech | Tustin | — | ◇ UNVERIFIED |
| DIDnr Industries, INC. | Anaheim | — | ◇ UNVERIFIED |
| DMDpr Machine Shop INC | Santa Ana | — | ◇ UNVERIFIED |
| DMDunham Metal Processing, Chuck Dunham | Orange | — | ◇ UNVERIFIED |
| DPDuran Polishing Corporation | Anaheim | — | ◇ UNVERIFIED |
| DMDy-co Metal Specialties INC | Huntington Beach | — | ◇ UNVERIFIED |
| DADynamic Air Engineering | Santa Ana | — | ◇ UNVERIFIED |
 Dynamic Fabrication INC | Santa Ana | — | ◇ UNVERIFIED |
| DWDynamic Weapon Solutions LLC | Huntington Beach | — | ◇ UNVERIFIED |
| DTDzyne Technologies | Irvine | — | ◇ UNVERIFIED |
| ECEdessa Corporation 'which Will Do Business in California As Naddours Ornamental | Santa Ana | — | ◇ UNVERIFIED |
 Edwards Lifesciences - Daimler 3009 | Santa Ana | — | ◇ UNVERIFIED |
| EMEfinea Metals | Los Alamitos | — | ◇ UNVERIFIED |
| ETElectrode Tech Inc, Reid Metal Finishing | Santa Ana | — | ◇ UNVERIFIED |
| EMElectrolurgy Manufacturing INC | Irvine | — | ◇ UNVERIFIED |
| ECElectron Coating, INC. | Garden Grove | — | ◇ UNVERIFIED |
| EPElectro-rack Prod INC | Anaheim | — | ◇ UNVERIFIED |
| ELElite Laser Plus, INC. | Santa Ana | — | ◇ UNVERIFIED |
| EIElucia INC Dba American Sheet Metal | Anaheim | — | ◇ UNVERIFIED |
| EPEmbee Plating CO | Santa Ana | — | ◇ UNVERIFIED |
