| CPChrysler Parkway Annex | Toledo | OH | Transportation Equipment Manufacturing336110 | — | ◇ UNVERIFIED |
| CTChrysler - Twinsburg Stamping Plant | Twinsburg | OH | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| CRCimbar Resources, INC | Wellsville | OH | Nonmetallic Mineral Product Manufacturing327992 | — | ◇ UNVERIFIED |
| CICintech Industrial Coatings | Cincinnati | OH | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| COCity of Dayton Lime Plant | Dayton | OH | Nonmetallic Mineral Product Manufacturing327410 | — | ◇ UNVERIFIED |
| CSCity Stone LLC | Milton, Township of | OH | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| CIClayton Industries | Evendale | OH | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| CHClestra Hauserman INC. Div. of Steelcase | Solon | OH | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| CCCleveland Central Enterprises | Cleveland | OH | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CCCleveland Commerce LLC | Cleveland | OH | Fabricated Metal Product Manufacturing332993 | — | ◇ UNVERIFIED |
| CHCleveland Heights City Pws | Cleveland Heights | OH | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| CLCleveland Laminating Corporation | Cleveland | OH | Paper Manufacturing322221 | — | ◇ UNVERIFIED |
| CRCleveland Range, LLC | Cleveland | OH | Machinery Manufacturing333310 | — | ◇ UNVERIFIED |
| CTCleveland Trencher | Euclid | OH | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| CIClippard Instument Laboratory INC (b087) | Fairfield | OH | Fabricated Metal Product Manufacturing332912 | — | ◇ UNVERIFIED |
| CPClorox Product Manufacturing CO. | Cleveland | OH | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CLClosed Loop Glass Solutions | Columbus | OH | Nonmetallic Mineral Product Manufacturing327212 | — | ◇ UNVERIFIED |
 Cnc Precision Machine INC | Garrettsville | OH | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| CLCnw Limited LLC | Cincinnati | OH | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| CRColor Resolutions Intl | Cincinnati | OH | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| CSColumbus Steel Castings | Columbus | OH | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| CACommercial Anodizing CO INC | Willoughby | OH | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CICommercial Induction | Cleveland | OH | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| CUCommercial Ullman Lubricants CO | Cleveland | OH | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| CVCommercial Vehicle Group - Chillicothe | Chillicothe | OH | Transportation Equipment Manufacturing336360 | — | ◇ UNVERIFIED |
| CACommonwealth Aluminum CO Bedford Coil Coating Div | Bedford | OH | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CEComposite Engineering LLC. (1413000550) | Amelia | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CEComposite Engineering LLC (1413010484) | Amelia | OH | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| CFConagra Foods | Columbus | OH | Food Manufacturing311211 | — | ◇ UNVERIFIED |
| CLConsumer Lighting (u.s.) LLC - Nela Park (1318182623) | East Cleveland | OH | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| CPContinental Products CO | Cleveland | OH | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| CIConvertapax INC | Midvale | OH | Plastics and Rubber Products Manufacturing326112 | — | ◇ UNVERIFIED |
| CACooper-standard Automotive | Cleveland | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CTCooper Tools - Hicksville Operation | Hicksville | OH | Machinery Manufacturing333991 | — | ◇ UNVERIFIED |
| CCCore Composites Cincinnati, LLC (1413020248) | Batavia | OH | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| CICorning Incorporated - Greenville, Oh | Greenville | OH | Nonmetallic Mineral Product Manufacturing327212 | — | ◇ UNVERIFIED |
| CGCoshocton Grain CO. | Coshocton | OH | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| CWCostco Wholesale | Columbus | OH | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| CVCountry View Woodworking, Ltd., Plant #3 | Midvale | OH | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| CLCounty Land Development Landfill (0250000828) | Salem | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CLCovestro LLC (0145020221) | Hebron | OH | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| CCCp Chemicals Group LP | Wickliffe | OH | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| CRCrest Rubber Company | Ravenna | OH | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| CACrossroads Asphalt | Columbia Station | OH | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| CTCrystal Tissue CO | Middletown | OH | Paper Manufacturing322121 | — | ◇ UNVERIFIED |
| CSCustar Stone CO INC Custar Plant | Custar | OH | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| CCCustom Chrome & Polishing | Cleveland | OH | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CHCustom Hardwoods | Mansfield | OH | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| CICustom-pak, INC. | Cleveland | OH | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CICustompak INC | Medina | OH | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
