| CDCascade Die Casting / Pacific | City of Industry | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CCCastaic Clay Manufacturing Company Incorporated | Castaic | CA | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| CACast Alloys INC | Northridge | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CICastrol Industrial | Los Angeles | CA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| CCCatalina Composites | Garden Grove | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CICatalina Industries INC | N Hollywood | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| CPCatalina Pacific Concrete CO Sun Valley Plant | Sun Valley | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CPCatalinia Pacific Concrete CO San Juan Plant | San Juan Capistrano | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CBCatalytica Bay View, INC. | East Palo Alto | CA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| CSCatalytic Solutions, INC. | Oxnard | CA | Machinery Manufacturing333413 | — | ◇ UNVERIFIED |
| CMC-brite Metal Finishing INC | Harbor City | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CSCdr Systems Corporation | Corcoran | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CMCelltech Manufacturing Ca, INC. | Santa Ana | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| CCementpro | Ontario | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| CACemex Admix Usa, LLC | Victorville | CA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Amador Plant | San Francisco | CA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Bakersfield | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Bell | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Farmersville | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Pacific LLC | Merced | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CFCemex Friant | Friant | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CMCemex Moorpark Plant | Moorpark | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CPCemex Pleasanton | Pleasanton | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CRCenco Refining CO. | Santa Fe Springs | CA | Food Manufacturing311225 | — | ◇ UNVERIFIED |
| CCCentral Concrete Supply - a US Concrete Company | Hayward | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CLCentury Laminators INC | Anaheim | CA | Plastics and Rubber Products Manufacturing326130 | — | ◇ UNVERIFIED |
| CPCentury Parts INC | Torrance | CA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| CWCepheid Warehouse | Sunnyvale | CA | Computer and Electronic Product Manufacturing334516 | — | ◇ UNVERIFIED |
| CICeradyne INC | Costa Mesa | CA | Chemical Manufacturing325220 | — | ◇ UNVERIFIED |
| CICeradyne INC 3m Company | Irvine | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| CMCerro Metal Products Company | Newark | CA | Primary Metal Manufacturing331421 | — | ◇ UNVERIFIED |
| CFCertified Fabricators INC | Buena Park | CA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| CEChalgren Enterprises INC | Gilroy | CA | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| CCCham Cal Engineering | Garden Grove | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CCChampion Chemical CO | Whittier | CA | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CECheek Engineering | Irvine | CA | Fabricated Metal Product Manufacturing332119 | — | ◇ UNVERIFIED |
| CAChemical and Pigment | Pittsburg | CA | Chemical Manufacturing325131 | — | ◇ UNVERIFIED |
| CCChemline Ca INC | Compton | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| CRChemoil Refining CORP | Signal Hill | CA | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| COChemstation of Los Angeles | Riverside | CA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| CIChem-tainer Industries INC | Compton | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CICherokee International INC | Tustin | CA | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| CMChristy Manufacturing Corporation | Rocklin | CA | Chemical Manufacturing325212 | 1-19 | ◇ UNVERIFIED |
| CVChristy Vault Company Tulare | Tulare | CA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| CTChrome Tech INC | Santa Ana | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CIChrometech INC | Santa Ana | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCChromplate CO INC | Inglewood | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CVChula Vista Energy Center LLC | Chula Vista | CA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCicomposites | Oxnard | CA | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| CMCie Manufacturing | South Gate | CA | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
