| Skedee Compressor Station | Compressor station | Pawnee County, OK | Petrolink Energy LLC | |
| Skin Creek | Underground storage | Lewis County, WV | Equitrans, L.P. | In service |
| Skipper Compressor Station | Compressor station | Stephens County, OK | DCP Operating Company, LP | |
| Skull Creek Dew Point | Gas processing plant | Moffat County, CO | Dominion Energy Questar Pipeline, LLC | In service |
| Skytrain Compressor Station | Compressor station | Carter County, OK | Xto Energy Inc | |
| Slapout Booster Station | Compressor station | Beaver County, OK | DCP Operating Company, LP | |
| Slaughter Gasoline Plant | Gas processing plant | Hockley County, TX | Oxy | In service |
| Slaughter Gasoline Plant (Mallet) | Gas processing plant | Hockley County, TX | Oxy | In service |
| Sligo Processing Facility | Gas processing plant | Bossier Parish, LA | Enable Midstream Partners, LP | In service |
| Smallwood Compressor Station | Compressor station | Custer County, OK | Oneok Field Services Inc | |
| Smiley Compressor Station | Compressor station | Major County, OK | Oneok Field Services Inc | |
| Smiley Hub | Gas processing plant | Gonzales County, TX | | |
| Smith Compressor Station | Compressor station | Grant County, OK | Targa Pipeline Midcontinent Westok LLC | |
| Smokehouse | Gas processing plant | Logan County, WV | Core Appalachia Operating LLC | In service |
| Snider 1 5h Compressor | Compressor station | Washita County, OK | Mito Resources LLC | |
| Snider 2 5 Compressor Station | Compressor station | Washita County, OK | Mito Resources LLC | |
| Snyder Gas Com B 1m CDP | Compressor station | NM | Hilcorp Energy Company | |
| Snyder Gasoline Plant | Gas processing plant | Scurry County, TX | Kinder Morgan CO2 Co. LP | In service |
| Soldier Compressor Station | Compressor station | Grady County, OK | ET Gathering & Processing, LLC | |
| Solera Compressor Facility | Compressor station | Pittsburg County, OK | Tall Oak Woodford | |
| Songbird Compessor Station | Compressor station | NM | Cotton Draw Midstream, LLC | |
| Sonora | Gas processing plant | Sutton County, TX | | |
| Sonora (Sutton County) | Gas processing plant | Sutton County, TX | | |
| Sonora Plant | Gas processing plant | Sutton County, TX | Enterprise Products Operating LP | In service |
| Sorrento | Underground storage | Ascension Parish, LA | Bridgeline Holdings, LP | In service |
| Sorrento Salt Dome Natural Gas Storage | Underground storage | LA | | |
| South Alig Compressor Station | Compressor station | Kingfisher County, OK | Oneok Field Services Inc | |
| South Baker Compressor Station | Compressor station | Texas County, OK | DCP Operating Company, LP | |
| South Bend | Underground storage | Armstrong County, PA | Dominion Energy Transmission Co | In service |
| South Bloomer Compressor Station | Compressor station | Major County, OK | Oneok Field Services Inc | |
| South Bryson | Underground storage | Jack County, TX | Energy Transfer Fuel LP | In service |
| South Canadian | Gas processing plant | Canadian County, OK | ET Gathering & Processing, LLC, Enable Products LLC | In service |
| South Canadian Compressor Station | Compressor station | Canadian County, OK | ET Gathering & Processing, LLC | |
| South Carlsbad Dew Point Plant | Gas processing plant | Eddy County, NM | Enterprise Products Operating LP | In service |
| South Cherokee Compressor Station | Compressor station | Alfalfa County, OK | Targa Pipeline Midcontinent Westok LLC | |
| South Chester 15 | Underground storage | Otsego County, MI | ANR Pipeline Company | In service |
| South Chitwood Compressor Station | Compressor station | Grady County, OK | DCP Operating Company, LP | |
| South Compressor CDP Facility | Compressor station | Hughes County, OK | Calyx Energy III LLC | |
| South Davenport Compressor Station | Compressor station | Lincoln County, OK | Petrolink Energy LLC | |
| South Delivery Compressor Station | Compressor station | Major County, OK | Oneok Field Services Inc | |
| South Eddy Cryo Plant | Gas processing plant | Eddy County, NM | Enterprise Field Services LLC, Enterprise Products Operating LP | In service |
| South Eunice CS | Compressor station | NM | Southern Union Gas Services, LTD | |
| South Florida Materials Albuquerque terminal | Terminal | NM | South Florida Materials Corp | |
| South Florida Materials Macon terminal | Terminal | GA | South Florida Materials Corp | |
| South Florida Materials Montgomery terminal | Terminal | AL | South Florida Materials Corp | |
| South Florida Materials Port Everglades terminal | Terminal | FL | South Florida Materials Corp | |
| South Florida Materials West Palm Beach terminal | Terminal | FL | South Florida Materials Corp | |
| South Hat Booster | Compressor station | NM | DCP Operating Company, LP | |
| South Hobbs Unit RCF | Compressor station | NM | Occidental Permian Limited Partnership | |
| South Hope Compressor Station | Compressor station | NM | Lucid Artesia Company | |