| Antero Midstream LLC, Midpoint Station | Compressor station | WV | | |
| Antero Midstream LLC, Monroe Station | Compressor station | WV | | |
| Antero Midstream LLC, Mountain Station | Compressor station | WV | | |
| Antero Midstream LLC, Nichols Station | Compressor station | WV | | |
| Antero Midstream LLC, Perkins Compressor Station | Compressor station | WV | | |
| Antero Midstream LLC, Pike Fork Station | Compressor station | WV | | |
| Antero Midstream LLC, Salem Compressor Station | Compressor station | WV | | |
| Antero Midstream LLC, South Canton Station | Compressor station | WV | | |
| Antero Midstream LLC, Tichenal Compressor Station | Compressor station | WV | | |
| Antero Midstream LLC, Torreys Peak Comp Station | Compressor station | WV | | |
| Antero Midstream LLC, Winans 1216 | Compressor station | WV | | |
| Antero Midstream LLC, Zinnia Station | Compressor station | WV | | |
| Antero Resources Corporation, New Milton Station | Compressor station | WV | | |
| Anthem Compressor Facility | Compressor station | Canadian County, OK | Tom-Stack | |
| Antioch Booster Station | Compressor station | Garvin County, OK | Oneok Field Services Inc | |
| Antioch Compressor Station | Compressor station | Garvin County, OK | Enerfin Gathering LLC | |
| Apex Oil MT Airy terminal | Terminal | LA | Apex Oil Company Inc | |
| Apex Oil Wilmington terminal | Terminal | NC | Apex Oil Company Inc | |
| Arapaho Plants 1-2-3 | Gas processing plant | Custer County, OK | Markwest Oklahoma Gas Company, LLC | In service |
| Arcadia | Underground storage | Bienville Parish, LA | Arcadia Gas Storage, LLC | In service |
| Arcadia Dome Salt Dome LPG Storage | Underground storage | LA | | |
| Arcadia Dome Salt Dome Natural Gas Storage | Underground storage | LA | | |
| Arcosa Wind Towers MFG Plant 1675 | Gas processing plant | Rogers County, OK | Arcosa Wind Towers Inc | |
| Ardmore Compressor Station | Compressor station | Carter County, OK | ET Gathering & Processing, LLC | |
| Ardmore Roofing Plant | Gas processing plant | Carter County, OK | Atlas Roofing Corp | |
| Ardmore Tire Plant | Gas processing plant | Carter County, OK | Michelin N America Inc | |
| Argent LNG | LNG export terminal | LA | | Pre-filing |
| Arguindegui Oil Co II Port Isabel terminal | Terminal | TX | Arguindegui Oil Co II LTD | |
| Arkoma Compressor Station | Compressor station | Coal County, OK | MarkWest Pioneer LLC | |
| Armenta Gas Com A 1 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Armenta Gas Com C 1a CDP | Compressor station | NM | Hilcorp Energy Company | |
| Armstrong | Gas processing plant | De Witt County, TX | | |
| Armstrong Plant | Gas processing plant | Eddy County, TX | Enterprise Products Operating LP | In service |
| Army Ammunition Compressor Site | Compressor station | Pittsburg County, OK | Merit Energy Company | |
| Army Compressor Station | Compressor station | Pittsburg County, OK | ET Gathering & Processing, LLC | |
| Army Station Treating Plant | Gas processing plant | Pittsburg County, OK | Kinder Morgan Treating LP | |
| Arnett Compressor Station | Compressor station | Ellis County, OK | DCP Operating Company, LP | |
| Arnie 3 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Arrow Gas Plant | Gas processing plant | Mckenzie County, ND | Crestwood | |
| Arrowhead | Gas processing plant | Reeves County, TX | | |
| Arrowhead Plant | Gas processing plant | Reeves County, TX | ETC Texas Pipeline, Ltd. | In service |
| Arsenal Resources LLC, Mackey Wolfe | Compressor station | WV | | |
| Artemas A | Underground storage | Bedford County, PA | Columbia Gas Transmission, LLC | In service |
| Artemas B | Underground storage | Bedford County, PA | Columbia Gas Transmission, LLC | In service |
| Artesia | Gas processing plant | Eddy County, NM | DCP Midstream, LP, DCP Operating Company, LP | In service |
| Asbury | Underground storage | Mesa County, CO | Public Service Co Of Colorado | In service |
| Ash Creek Compressor Station | Compressor station | Pittsburg County, OK | Petrolink Energy LLC | |
| Ash Foster Compressor Station | Compressor station | Kingfisher County, OK | Bce-Mach III Midstream Holdings LLC | |
| Ashland 1 Treating Plant | Gas processing plant | Pittsburg County, OK | Kinder Morgan Treating LP | |
| Ashland 2 Compressor Station | Compressor station | Coal County, OK | ET Gathering & Processing, LLC | |