| South Indian Basin CPMR STA | Compressor station | NM | Occidental Permian Limited Partnership | |
| South Knox Compressor Station | Compressor station | Stephens County, OK | Oneok Field Services Inc | |
| South Oakwood Compressor Station | Compressor station | Blaine County, OK | ET Gathering & Processing, LLC | |
| South Of Lincoln Compressor Station | Compressor station | Kingfisher County, OK | Bce-Mach III Midstream Holdings LLC | |
| South Okemah Compressor Station | Compressor station | Okfuskee County, OK | Enerfin Gathering-East LLC | |
| South Portland terminal | Terminal | ME | South Portland Terminal LLC | |
| South Poteau Compressor Station | Compressor station | Le Flore County, OK | ET Gathering & Processing, LLC | |
| South Quinton Compressor Station | Compressor station | Pittsburg County, OK | ET Gathering & Processing, LLC | |
| South Welda | Underground storage | Anderson County, KS | Southern Star Central Gas Pipeline, Inc. | In service |
| South Yale Compressor Station | Compressor station | Payne County, OK | Petrolink Energy LLC | |
| Southeast Booster Station DHGP | Compressor station | Kingfisher County, OK | Mustang Gas Products, LLC | |
| Southeast Emulsions Perry Asphal terminal | Terminal | GA | Southeast Emulsions Inc | |
| Southeast Emulsions Union Asphal terminal | Terminal | SC | Southeast Emulsions Inc | |
| Southeast Spiro Compressor Station | Compressor station | Le Flore County, OK | Enable Gas Transmission, LLC | |
| Southern Pines Energy Center | Underground storage | Greene County, MS | SG Resources Mississippi, LLC | In service |
| Southern Star CTL Gas Pipeline Mutual Compressor Station | Compressor station | Woodward County, OK | Southern Star CTL Gas Pipeline Inc | |
| Southern Star CTL Gas Pipeline Nash Compressor Station | Compressor station | Grant County, OK | Southern Star CTL Gas Pipeline Inc | |
| Southern Star Compressor Facility | Compressor station | Nowata County, OK | Acme Energy Dba Ok Gas Services LLC | |
| Southern States Cooperative Owensboro River Terminal | Terminal | KY | Southern States Cooperative Inc | |
| Southwest Beaver Compressor Station | Compressor station | Beaver County, OK | Crown Midstream LLC | |
| Southwest Ozona | Gas processing plant | Crockett County, TX | DCP Operating Company, LP | In service |
| Soy Isolate Production Plant | Gas processing plant | Mayes County, OK | Solae Co LLC | |
| Sparrow Compressor Facility | Compressor station | Coal County, OK | Tall Oak Woodford | |
| Spaulding Compressor Station | Compressor station | Seminole County, OK | Petrolink Energy LLC | |
| Spearman Plant | Gas processing plant | Ochiltree County, TX | ETC Field Services LLC | In service |
| Spindle | Gas processing plant | Weld County, CO | DCP Operating Company, LP | In service |
| Spindletap Compressor Station | Compressor station | Blaine County, OK | Tom-Stack | |
| Spindletop | Underground storage | Jefferson County, TX | Centana Interstate Pipeline LLC | In service |
| Spire Storage/clearcreek | Underground storage | Uinta County, WY | Spire Storage West LLC | In service |
| Spiro Compressor Station | Compressor station | Le Flore County, OK | Merit Energy Company | |
| Spiro Prospect Compressor Site 1 | Compressor station | Le Flore County, OK | Oil And Gas Producers Inc | |
| Spitfire Compressor Station | Compressor station | Coal County, OK | VM Arkoma Stack, LLC | |
| Spivey | Gas processing plant | Harper County, KS | Pioneer Exploration, LLC | In service |
| Spraberry Plant | Gas processing plant | Midland County, TX | Navitas Midstream Midland Basin, LLC | In service |
| Spradlin Compressor Station | Compressor station | Washita County, OK | Palo Duro G And P Oklahoma LP | |
| Sprague Compressor Station | Compressor station | Coal County, OK | Markwest Oklahoma Gas Company, LLC | |
| Sprague Operating Resources Avery Lane terminal | Terminal | NH | Sprague Operating Resources LLC | |
| Sprague Operating Resources Bridgeport terminal | Terminal | CT | Sprague Operating Resources LLC | |
| Sprague Operating Resources East Providence terminal | Terminal | RI | Sprague Operating Resources LLC | |
| Sprague Operating Resources Everett terminal | Terminal | MA | Sprague Operating Resources LLC | |
| Sprague Operating Resources New Bedford terminal | Terminal | MA | Sprague Operating Resources LLC | |
| Sprague Operating Resources Providence terminal | Terminal | RI | Sprague Operating Resources LLC | |
| Sprague Operating Resources Quincy TRT terminal | Terminal | MA | Sprague Operating Resources LLC | |
| Sprague Operating Resources Quincy terminal | Terminal | MA | Sprague Operating Resources LLC | |
| Sprague Operating Resources Rensellaer terminal | Terminal | NY | Sprague Operating Resources LLC | |
| Sprague Operating Resources River Road terminal | Terminal | NH | Sprague Operating Resources LLC | |
| Sprague Operating Resources Searsport terminal | Terminal | ME | Sprague Operating Resources LLC | |
| Sprague Operating Resources South Portland terminal | Terminal | ME | Sprague Operating Resources LLC | |
| Sprague Operating Resources Springfield Armory terminal | Terminal | MA | Sprague Operating Resources LLC | |
| Sprague Operating Resources Springfield ST James terminal | Terminal | MA | Sprague Operating Resources LLC | |