| Columbia Gas Transmission, LLC, Frametown | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Glady Compressor | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Glenville | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Grant Station | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Hamlin | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Horse Creek | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Hubball | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Huff Creek | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Hunt | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Kenova | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Lanham | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Lone Oak Station | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Lost River | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Mount Olive | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Ripley | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Rockport | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Saunders Creek RS | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Seneca | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Sherwood Station | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Smithfield | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, St. Albans Area Office | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Terra Alta | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, Walgrove | Compressor station | WV | | |
| Columbia Gas Transmission, LLC, White Oak Station | Compressor station | WV | | |
| Columbiana | Underground storage | OH | Lake Shore Gas Storage Inc | |
| Columbus | Underground storage | St. Clair County, MI | Michigan Consolidated Gas Company | In service |
| Columbus City | Underground storage | Louisa County, IA | Natural Gas Pipeline Company of America LLC | In service |
| Columbus Compressor Station | Compressor station | Hughes County, OK | Petrolink Energy LLC | |
| Columbus Terminal | Terminal | ND | | |
| Comanche Compressor Station | Compressor station | NM | Lucid Artesia Company | |
| Comanche Plant | Gas processing plant | Reeves County, TX | | |
| Comet | Underground storage | Taylor County, WV | Equitrans, L.P. | In service |
| Cominco Compressor Station | Compressor station | Grady County, OK | ET Gathering & Processing, LLC | |
| Commonwealth LNG | LNG export terminal | LA | | Approved |
| Community Compressor Station | Compressor station | Blaine County, OK | Tom-Stack | |
| Como Booster Station | Compressor station | Beaver County, OK | DCP Operating Company, LP | |
| Compressor Station 102 | Compressor station | Beaver County, OK | Natural Gas Pipeline Company of America LLC | |
| Compressor Station 159 | Compressor station | Woodward County, OK | Natural Gas Pipeline Company of America LLC | |
| Compressor Station 184 | Compressor station | Beckham County, OK | Natural Gas Pipeline Company of America LLC | |
| Concho Booster Station | Compressor station | Canadian County, OK | DCP Operating Company, LP | |
| Concrete Compressor Station | Compressor station | Caddo County, OK | Bounty Transfer LLC | |
| Concrete Plant CP002 | Gas processing plant | Oklahoma County, OK | Duininck Inc | |
| Concrete Plant CP007 | Gas processing plant | Oklahoma County, OK | Duininck Inc | |
| Consumers Oil Corp terminal | Terminal | NJ | Consumers Oil Corp | |
| Conway - Oneok Storage terminal | Terminal | KS | Oneok Hydrocarbon LP | |
| Conwill Compressor Station | Compressor station | Texas County, OK | Scout Energy Management LLC | |
| Cook Inlet LNG | LNG import terminal | AK | | Pre-filing |
| Cooks Mills | Underground storage | Douglas County, IL | Natural Gas Pipeline Company of America LLC | In service |
| Coop Compressor Facility | Compressor station | Kingfisher County, OK | Tom-Stack | |
| Copley Extraction Plant | Gas processing plant | Lewis County, WV | Dominion Energy Transmission Co | In service |