| Clark-Cooper Valves Division of Magnatrol NJ | Manufacturing | 0 | — | A |
| Clark-Devon Hardware Co., Inc. IL | Retail Trade | 0 | — | A |
| Clark-Lindsey Village, Inc. IL | Healthcare & Social Assistance | 0 | — | F |
| Clark-Reliance Corporation OH | Manufacturing | 0 | — | C |
| Clark/Sullivan Construction NV | Construction | 0 | — | A |
| Clarke IL | Manufacturing | 0 | — | B |
| CLARKE & CO., INC. CO | Administrative & Waste Services | 0 | — | A |
| Clarke & Esposito LLC DC | Professional & Technical Services | 2 | $520,000 | — |
| Clarke & Rush Mechanical, Inc CA | Construction | 0 | — | F |
| Clarke American (Harland Clarke)-San Antonio TX | — | 0 | — | — |
| Clarke Construction Group, Inc FL | Construction | 0 | — | D |
| Clarke County VA | Public Administration | 0 | — | A |
| Clarke County Board of Education (School District) GA | Educational Services | 3 | $60,464 | — |
| Clarke County School District GA | Educational Services | 2 | $55,248 | — |
| Clarke Customer Care MA | Other Services | 0 | — | F |
| Clarke Distribution Corporation MA | Wholesale Trade | 0 | — | A |
| Clarke Distribution Corporation NY | Other Services | 0 | — | A |
| Clarke Distributors, Inc. NH | — | 0 | — | — |
| Clarke Electric Cooperative, Inc. IA | Utilities | 0 | — | A |
| Clarke Mosquito Abatement IL | Manufacturing | 0 | — | C |
| Clarke Mosquito Control IL | Manufacturing | 0 | — | F |
| Clarke Mosquito Control OH | Administrative & Waste Services | 0 | — | A |
| Clarke Packing & Crating Company IL | Manufacturing | 0 | — | F |
| Clarke Power Services, Inc IN | Other Services | 0 | — | F |
| Clarke Power Services, Inc KY | Other Services | 0 | — | A |
| Clarke Power Services, Inc MO | Other Services | 0 | — | C |
| Clarke Power Services, Inc NC | Other Services | 0 | — | B |
| Clarke Power Services, Inc OH | Other Services | 0 | — | B |
| Clarke Power Services, Inc TN | Other Services | 0 | — | C |
| Clarke Washington Electric Membership Cooperative AL | Utilities | 0 | — | D |
| Clarke's Sheet Metal OR | Manufacturing | 0 | — | F |
| Clarkfield Care Center MN | Healthcare & Social Assistance | 0 | — | F |
| Clarkfield Home Health Agency MN | Healthcare & Social Assistance | 0 | — | F |
| Clarks Ameriacs PA | — | 0 | — | — |
| Clarks Americas, Inc. CA | — | 0 | — | — |
| Clarks Americas, Inc. PA | Transportation & Warehousing | 0 | — | A |
| Clarks Americas, Inc. Distribution Facility PA | — | 0 | — | — |
| Clarks Feed Mills Inc PA | Manufacturing | 0 | — | A |
| Clarks Grain Store Inc NH | Transportation & Warehousing | 0 | — | A |
| clarks oyster bar llc TX | Accommodation & Food Services | 0 | — | A |
| Clarksburg Publishing Company WV | Information & Media | 0 | — | A |
| Clarksdale Nursing Center MS | Healthcare & Social Assistance | 0 | — | F |
| Clarkson Eyecare, LLC MO | Healthcare & Social Assistance | 1 | $118,414 | — |
| Clarkson Hospitality Developers, LLC NY | Accommodation & Food Services | 0 | — | A |
| Clarkson Regional Health Services, Inc. NE | Administrative & Waste Services | 1 | $85,730 | — |
| Clarkson University NY | Educational Services | 2 | $80,500 | — |
| ClarksTech LLC MD | Professional & Technical Services | 7 | $563,126 | — |
| ClarksTech LLC NC | Professional & Technical Services | 1 | $109,283 | — |
| Clarkston Cleaning Services, LLC MI | Administrative & Waste Services | 0 | — | A |
| Clarksville Dept of Electricity TN | Utilities | 0 | — | B |
