| Alamo | Gas processing plant | Houston County, TX | Energy Transfer | In service |
| Alaska LNG | LNG export terminal | AK | | Approved |
| Albany Terminal | Terminal | NY | | |
| Alden | Underground storage | Rice County, KS | Southern Star Central Gas Pipeline, Inc. | In service |
| Aledo Booster Station | Compressor station | Dewey County, OK | DCP Operating Company, LP | |
| Aledo Taylor Amine Plant | Gas processing plant | Dewey County, OK | Forester Midstream LLC | |
| Alex Compressor Station | Compressor station | Grady County, OK | ET Gathering & Processing, LLC | |
| Alexandria Terminal Co LLC | Terminal | LA | Alexandria Terminal Co LLC | |
| Alfalfa Compressor Station | Compressor station | Alfalfa County, OK | ET Gathering & Processing, LLC | |
| Alford | Underground storage | Pike County, IN | Texas Gas Transmission, LLC | In service |
| Alice Bolack 13 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Alice Bolack 2 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Alice Bolack 5 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Aline Booster Station | Compressor station | Alfalfa County, OK | DCP Operating Company, LP | |
| Aline Compressor Station | Compressor station | Alfalfa County, OK | Targa Pipeline Midcontinent Westok LLC | |
| Alisha Booster Station | Compressor station | NM | DCP Operating Company, LP | |
| Aliso Canyon | Underground storage | Los Angeles County, CA | Southern California Gas Co | In service |
| Allen Astec Portable Plant 1 | Gas processing plant | Mcclain County, OK | Allen Contracting | |
| Allen Compressor Station | Compressor station | Hughes County, OK | Enable Gas Transmission, LLC | |
| Allison 110h/152h CDP | Compressor station | NM | Hilcorp Energy Company | |
| Allison Gas Plant | Gas processing plant | Wheeler County, TX | Enbridge Pipelines (texas Gathering) Inc. | In service |
| Allison Gas Plants | Gas processing plant | Wheeler County, TX | | |
| Aloe Ventures | Gas processing plant | Toole County, MT | Lamarsa Corp | In service |
| Aloha Petroleum Hilo Terminal | Terminal | HI | Aloha Petroleum LTD | |
| Aloha Petroleum Hilo Terminal - 2 West | Terminal | HI | Aloha Petroleum LTD | |
| Aloha Petroleum Honolulu Terminal | Terminal | HI | Aloha Petroleum LTD | |
| Aloha Petroleum Kahului Terminal | Terminal | HI | Aloha Petroleum LTD | |
| Aloha Petroleum Nawiliwili terminal | Terminal | HI | Aloha Petroleum LTD | |
| Aloha Petroleum Thomas Malone Terminal | Terminal | HI | Aloha Petroleum LTD | |
| Alon Bakersfield Property Bakersfield terminal | Terminal | CA | Alon Bakersfield Property, Inc. | |
| Alon USA Duncan Storage Terminal | Terminal | OK | Alon Usa, LP | |
| Alpha Compressor Station | Compressor station | Kingfisher County, OK | Markwest Oklahoma Gas Company, LLC | |
| Altamont Gas Plant | Gas processing plant | Duchesne County, UT | Kinder Morgan Altamont LLC | In service |
| Altona Booster Station | Compressor station | Kingfisher County, OK | DCP Operating Company, LP | |
| Alva N Hopeton Compressor Station | Compressor station | Woods County, OK | Panhandle Eastern Pipe Line Company, LP | |
| Ambassador (mississippi Lime) | Underground storage | Clay County, TX | Cago Inc | |
| Amber Booster Station | Compressor station | Grady County, OK | DCP Operating Company, LP | |
| Amber Compressor Station | Compressor station | Grady County, OK | Unit Petroleum Company | |
| Amber Gas Plant | Gas processing plant | Grady County, OK | | In service |
| Amber Junction Compressor Station | Compressor station | Grady County, OK | Enable Gas Transmission, LLC | |
| Ambrose Gas Plant | Gas processing plant | Divide County, ND | Sterling Energy, Inc | |
| Ameren Illinois Tilden | Underground storage | St. Clair County, IL | Ameren Illinois Company | In service |
| American Horse Compressor Station | Compressor station | Blaine County, OK | ET Gathering & Processing, LLC | |
| American River Transp ST Louis terminal | Terminal | MO | American River Transp CO | |
| Amerigas Propane Sinking Spring terminal | Terminal | PA | Amerigas Propane | |
| Ames Booster Station | Compressor station | Major County, OK | DCP Operating Company, LP | |
| Ammunition Plant | Gas processing plant | Pittsburg County, OK | McAlester Army Ammo PLT | |
| Amorita Compressor Station | Compressor station | Alfalfa County, OK | Targa Pipeline Midcontinent Westok LLC | |
| Amory | Underground storage | Monroe County, MS | Atmos Energy Corporation - Mississip | In service |
| Ancona | Underground storage | Livingston County, IL | Nicor | In service |