| Salem | Underground storage | Allegan County, MI | Consumers Energy Inc | In service |
| Salem Gas Plant | Gas processing plant | Marion County, IL | Citation Oil & Gas Corp | In service |
| Sallisaw Plant | Gas processing plant | Sequoyah County, OK | Cellofoam Na Inc | |
| Salt Creek | Gas processing plant | Kent County, TX | | |
| Salt Creek Compressor Station | Compressor station | Creek County, OK | Oneok Gas Transportation, LLC | |
| Salt Creek Gas Plant | Gas processing plant | WY | | |
| Salt Creek Processing Plant | Gas processing plant | Kent County, TX | Occidental Permian Limited Partnership | In service |
| Salt Fork Compressor Station | Compressor station | Alfalfa County, OK | Targa Pipeline Midcontinent Westok LLC | |
| Salt Plains Storage | Underground storage | Grant County, OK | Salt Plains Storage Inc | In service |
| Saltville Storage | Underground storage | Washington County, VA | Saltville Gas Storage Company, LLC | In service |
| San Bois Compressor Station | Compressor station | Pittsburg County, OK | ET Gathering & Processing, LLC | |
| San Bois Treating Plant | Gas processing plant | Pittsburg County, OK | Kinder Morgan Treating LP | |
| San Juan 32-7 Unit 247h Lateral Compressor | Compressor station | NM | Hilcorp Energy Company | |
| San Juan 32-8 227 Compressor | Compressor station | NM | Hilcorp Energy Company | |
| San Juan 32-8 Unit 254a Lateral Compressor | Compressor station | NM | Hilcorp Energy Company | |
| San Juan Gas Plant | Gas processing plant | San Juan County, NM | Harvest Pipeline Company, Hilcorp Energy Company | In service |
| San Martin | Gas processing plant | Bexar County, TX | | |
| San Martin (Bexar County) | Gas processing plant | Bexar County, TX | | |
| San Martin Natural Gas Plant | Gas processing plant | Bexar County, TX | Enterprise Hydrocarbons LP | In service |
| San Pedro CS 1 | Compressor station | Dimmit County, TX | | |
| San Pedro CS 2 | Compressor station | Dimmit County, TX | | |
| San Pedro CS 3 | Compressor station | Dimmit County, TX | | |
| San Pedro CTB 16 | Compressor station | Dimmit County, TX | | |
| Sand Creek Compressor Station | Compressor station | Beaver County, OK | DCP Operating Company, LP | |
| Sand Dunes Compressor Station | Compressor station | NM | Enterprise Products Operating LP | |
| Sanderson Gas Plant | Gas processing plant | Williams County, ND | Kinder Morgan | |
| Sandrock South Pod | Compressor station | NM | Hilcorp Energy Company | |
| Sandstone Creek Compressor Station | Compressor station | Roger Mills County, OK | ET Gathering & Processing, LLC | |
| Santa Clara Valley Gas Plant | Gas processing plant | Ventura County, CA | Vintage Pipeline Inc | In service |
| Santa Fe Compressor Station | Compressor station | Stephens County, OK | Enerfin Gathering LLC | |
| Santa Fe Operating Salt Creek Compressor Station | Compressor station | Coal County, OK | Santa Fe Operating LLC | |
| Sapphire Compressor Station | Compressor station | Canadian County, OK | Enlink Midstream Services, LLC | |
| Sapulpa Plant | Gas processing plant | Creek County, OK | Ardagh Glass Inc | |
| Saratoga RP East Albany terminal | Terminal | GA | Saratoga RP East LLC | |
| Saratoga RP East TPSL Columbus terminal | Terminal | GA | Saratoga RP East LLC | |
| Sasakwa Compressor Station | Compressor station | Seminole County, OK | Enable Oklahoma Intrastate Transmission, LLC | |
| Saturated Felt Plant | Gas processing plant | Mayes County, OK | Gap Roofing CO | |
| Saunders Plant | Gas processing plant | Lea County, NM | Targa Midstream Services LP | In service |
| Savage Energy Terminal | Terminal | UT | | |
| Savage Terminal | Terminal | ND | | |
| Sawtooth terminal | Terminal | UT | Sawtooth NGL Caverns LLC | |
| Sayre | Underground storage | Beckham County, OK | Natural Gas Pipeline Company of America LLC | In service |
| Sayre Terminal | Terminal | OK | | |
| Scarbrough Compressor Station | Compressor station | Pittsburg County, OK | Markwest Oklahoma Gas Company, LLC | |
| Schiralli Construction Portable Plant 1 | Gas processing plant | Carter County, OK | Schiralli Construction Corp | |
| Schrock Compressor Station | Compressor station | Custer County, OK | ET Gathering & Processing, LLC | |
| Schwarz 1 36h Compressor Facility | Compressor station | Pittsburg County, OK | Trinity Operating Usg LLC | |
| Schwarz 2 35h Compressor Facility | Compressor station | Pittsburg County, OK | Trinity Operating Usg LLC | |
| Schwarz Compressor Station | Compressor station | Pittsburg County, OK | Markwest Oklahoma Gas Company, LLC | |
| Schwerdtfeger 11 CDP | Compressor station | NM | Hilcorp Energy Company | |