| Platteville | Gas processing plant | Weld County, CO | DCP Operating Company, LP | In service |
| Playa Del Rey | Underground storage | Los Angeles County, CA | Southern California Gas Co | In service |
| Pleasant Creek | Underground storage | Yolo County, CA | Pacific Gas and Electric Co | In service |
| Pleasant View Compressor Station | Compressor station | Woods County, OK | ET Gathering & Processing, LLC | |
| Pmi Portable Plant 1 | Gas processing plant | Love County, OK | Paving Materials Inc | |
| Poker Lake Compressor Station | Compressor station | NM | Enterprise Products Operating LP | |
| Poll Compressor Station | Compressor station | Lincoln County, OK | Petrolink Energy LLC | |
| Ponca City Municipal Steam Plant | Gas processing plant | Kay County, OK | Ok Muni PWR Athrty | |
| Poncho Compressor Station | Compressor station | Haskell County, OK | 4g Operating LLC | |
| Ponderosa Amine Plant | Gas processing plant | Latimer County, OK | Ponderosa Gathering, LLC | |
| Ponderosa Compressor Station 1 | Compressor station | Pittsburg County, OK | Ponderosa Gathering, LLC | |
| Ponderosa Compressor Station 2 | Compressor station | Pittsburg County, OK | Ponderosa Gathering, LLC | |
| Ponderosa Compressor Station 3 | Compressor station | Pittsburg County, OK | Ponderosa Gathering, LLC | |
| Ponderosa Compressor Station 4 | Compressor station | Pittsburg County, OK | Ponderosa Gathering, LLC | |
| Pontiac | Underground storage | Livingston County, IL | Nicor | In service |
| Pontotoc Sand And Stone Portable Plant 1 | Gas processing plant | Pontotoc County, OK | Pontotoc Sand And Stone | |
| Port Arthur LNG | LNG export terminal | TX | | Under construction |
| Port Barre Salt Dome | Underground storage | St. Landry Parish, LA | Bobcat Gas Storage | In service |
| Port Manchac Terminal | Terminal | LA | | |
| Port of Minot | Terminal | ND | | |
| Port of New Orleans | Terminal | LA | | |
| Port of Vancouver | Terminal | WA | | |
| Portable Cedarapids 8835 Plant 2754 | Gas processing plant | Atoka County, OK | Cummins Construction Co Inc | |
| Portable Cmi Plant 2745 | Gas processing plant | Payne County, OK | Cummins Construction Co Inc | |
| Portable Eagle Crusher Plant 3135 | Gas processing plant | Pontotoc County, OK | Cummins Construction Co Inc | |
| Portable Plant 1 | Gas processing plant | Caddo County, OK | Harrison Gypsum LLC Dba Arcosa Specialty Materials | |
| Portable Plant 510 | Gas processing plant | Cleveland County, OK | Eagle Redi Mix Concrete LLC | |
| Portales CS | Compressor station | NM | Transwestern Pipeline Company, LLC | |
| Portland Maine Terminal | Terminal | ME | | |
| Portman | Underground storage | Butler County, PA | Peoples Gas Company LLC | In service |
| Potac LLC terminal | Terminal | TX | Potac, LLC | |
| Potato Hills Compressor Station | Compressor station | Latimer County, OK | Sanguine Gas Exploration, LLC | |
| Poteau Compressor Station | Compressor station | Le Flore County, OK | Enable Gas Transmission, LLC | |
| Poteet Compressor Station | Compressor station | Stephens County, OK | ET Gathering & Processing, LLC | |
| Pottsville South | Underground storage | Hamilton County, TX | Enstor Katy Storage & Transplp | |
| Powell CDP | Compressor station | Panola County, TX | | |
| Powell Compressor Station | Compressor station | Pittsburg County, OK | ET Gathering & Processing, LLC | |
| Powell Treating Plant | Gas processing plant | Pittsburg County, OK | Kinder Morgan Treating LP | |
| Prairie Compressor Facility | Compressor station | Mcintosh County, OK | Tall Oak Woodford | |
| Prairie Rose Pipeline Gas Plant | Gas processing plant | Mountrail County, ND | Aux Sable | |
| Pratt | Underground storage | Greene County, PA | Equitrans, L.P. | In service |
| Preacher Lee CDP | Compressor station | Rusk County, TX | | |
| Preakness Compressor Station | Compressor station | Canadian County, OK | Blue Mountain Midstream LLC | |
| Premcor Refining Group Ark City terminal | Terminal | KS | Premcor Refining Group Inc | |
| Premcor Refining Group Fannett terminal | Terminal | TX | Premcor Refining Group Inc | |
| Premcor Refining Group W Memphis terminal | Terminal | AR | Premcor Refining Group Inc | |
| Premier DeBeque | Gas processing plant | Mesa County, CO | Red Rock Gathering Company, LLC. | In service |
| Premier Plant Services LLC | Gas processing plant | Creek County, OK | Premier Plant Services LLC | |
| Prentise Treating Plant | Gas processing plant | Beckham County, OK | Palo Duro G And P Oklahoma LP | |
| Prentiss Compressor Station | Compressor station | Beckham County, OK | Midpoint Midstream LLC | |