| Corpus Christi, City Of - Gas Div | Owner/operator | Corpus Christi, TX | | |
| Coterra Energy Operating Co. | Owner/operator | Houston, TX | | 5 |
| Cotton Draw Midstream, LLC | Owner/operator | Oklahoma City, OK | | 6 |
| Cottrellville Pipeline | Owner/operator | Marine City, MI | | 1 |
| Countrymark Cooperative, LLP | Owner/operator | | | |
| Countrymark Refining And Logistics, LLC | Owner/operator | Indianapolis, IN | | 8 |
| Cove Point Lng, Limited Partnership | Owner/operator | Lusby, MD | 2 | |
| Covey Park Gas LLC | Owner/operator | Dallas, TX | | 1 |
| Covey Park Operating LLC | Owner/operator | | | |
| Covey Park Resources LLC | Owner/operator | Dallas, TX | | 1 |
| Covia Solutions LLC | Owner/operator | | | 1 |
| Cowboy Midstream LLC | Owner/operator | Casper, WY | | 2 |
| Cowboy Pipeline Co | Owner/operator | | | |
| Cowboy Pipeline Operators LLC | Owner/operator | Houston, TX | | 2 |
| Cowtown Gas Processing Partners LP | Owner/operator | | | 2 |
| Cowtown Pipeline Partners L.p. | Owner/operator | Houston, TX | | 2 |
| Cox Operating LLC | Owner/operator | New Orleans, LA | | 2 |
| Coyote Hill Midstream LLC | Owner/operator | Denver, CO | | 1 |
| Coyote Springs Plant - Portland General Electric | Owner/operator | Portland, OR | | 1 |
| Cpe Gathering Midcon, LLC | Owner/operator | Dallas, TX | | 1 |
| Cpi Operations LLC | Owner/operator | | | 1 |
| Cpra | Owner/operator | | 1 | |
| Cranberry Creek Landfill, LLC | Owner/operator | Wisconsin Rapids, WI | | |
| Cranberry Pipeline Corporation | Owner/operator | Birmingham, AL | | 3 |
| Craton Etx Gathering Utility LLC | Owner/operator | Tyler, TX | | 2 |
| Craton Operating, LLC | Owner/operator | Tyler, TX | | 8 |
| Crawford County Gas Gathering, LLC | Owner/operator | Vincennes, IN | | 1 |
| Crawford Hughes Operating Co. | Owner/operator | | | 1 |
| Creedmoor Pipeline LLC | Owner/operator | Creedmoor, TX | | 2 |
| Creole Trail Lng, LP And Cheniere Creole Trail Pipeline Company | Owner/operator | | 1 | |
| Crescendo Resources, L.p. | Owner/operator | | | 1 |
| Crescent City Power, LLC | Owner/operator | | 1 | |
| Crescent Midstream, LLC | Owner/operator | Gray, LA | | 2 |
| Crescent Midstream, LLC C/o Chapman Consulting, Inc. | Owner/operator | | 1 | |
| Crescent Pipeline Partnership, LP | Owner/operator | Houston, TX | | 1 |
| Crescent Pipeline Prnshp, L.p. | Owner/operator | | | 5 |
| Cresstex DC Gathering Company, J.v. | Owner/operator | | | |
| Crest Petroleum, LLC | Owner/operator | | | 2 |
| Crestone Energy Ventures LLC | Owner/operator | | | 1 |
| Crestone Peak Resources LP | Owner/operator | Denver, CO | | 2 |
| Crestone Powder River, LLC | Owner/operator | | | 2 |
| Crestwood | Owner/operator | | 1 | 2 |
| Crestwood Arkansas Pipeline LLC | Owner/operator | Houston, TX | | 1 |
| Crestwood Dakota Pipeline LLC | Owner/operator | Houston, TX | | 1 |
| Crestwood Equity Partners LP | Owner/operator | | 2 | |
| Crestwood Midstream Partners LP | Owner/operator | Houston, TX | | 8 |
| Crestwood New Mexico Pipeline LLC | Owner/operator | | | 3 |
| Crestwood Panhandle Pipeline LLC | Owner/operator | Houston, TX | | 4 |
| Crestwood Permian Basin | Owner/operator | | 1 | |
| Crestwood Pipeline East LLC | Owner/operator | Houston, TX | | 1 |