| Moon Compressor Station | Compressor station | Blaine County, OK | ET Gathering & Processing, LLC | |
| Mooreland Plant | Gas processing plant | Woodward County, OK | DCP Operating Company, LP | In service |
| Moorewood Compressor Station | Compressor station | Roger Mills County, OK | ET Gathering & Processing, LLC | |
| Moran Compressor Station | Compressor station | Oklahoma County, OK | Cavanal Midstream LLC | |
| MorningStar Operating Buckeye CO2 Plant | Gas processing plant | NM | MorningStar Operating LLC | |
| Morris CDP | Compressor station | NM | Hilcorp Energy Company | |
| Morris Compressor Station | Compressor station | Grady County, OK | ET Gathering & Processing, LLC | |
| Morton 2 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Moscow Compressor Station | Compressor station | Woodward County, OK | DCP Operating Company, LP | |
| Moss Bluff Storage Dome | Underground storage | Liberty County, TX | Moss Bluff Hub Partners LP | In service |
| Moss Compressor Station | Compressor station | Hughes County, OK | Markwest Oklahoma Gas Company, LLC | |
| Motiva Enterprises Bainbridge Blending Terminal | Terminal | GA | Motiva Enterprises LLC | |
| Motiva Enterprises Baltimore Blending Terminal | Terminal | MD | Motiva Enterprises LLC | |
| Motiva Enterprises Beaumont Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises Charlotte North Blending Terminal | Terminal | NC | Motiva Enterprises LLC | |
| Motiva Enterprises Charlotte South Blending Terminal | Terminal | NC | Motiva Enterprises LLC | |
| Motiva Enterprises Dallas Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises Doraville Eastwest Terminal | Terminal | GA | Motiva Enterprises LLC | |
| Motiva Enterprises Doraville South Blending Terminal | Terminal | GA | Motiva Enterprises LLC | |
| Motiva Enterprises Fairfax Blending Terminal | Terminal | VA | Motiva Enterprises LLC | |
| Motiva Enterprises Fayetteville Blending Terminal | Terminal | NC | Motiva Enterprises LLC | |
| Motiva Enterprises Fort Worth Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises Greensboro Blending Terminal | Terminal | NC | Motiva Enterprises LLC | |
| Motiva Enterprises Hearne Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises LLC Port Neches Port Neches terminal | Terminal | TX | Motiva Enterprises LLC Port Neches | |
| Motiva Enterprises Pasadena Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises Port Everglades East Terminal | Terminal | FL | Motiva Enterprises LLC | |
| Motiva Enterprises Port Everglades South Terminal | Terminal | FL | Motiva Enterprises LLC | |
| Motiva Enterprises Port Everglades West Terminal | Terminal | FL | Motiva Enterprises LLC | |
| Motiva Enterprises Port Tampa Blending Terminal | Terminal | FL | Motiva Enterprises LLC | |
| Motiva Enterprises Raleigh Blending Terminal | Terminal | NC | Motiva Enterprises LLC | |
| Motiva Enterprises Richmond Blending Terminal | Terminal | VA | Motiva Enterprises LLC | |
| Motiva Enterprises San Antonio Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motiva Enterprises Spartanburg Blending Terminal | Terminal | SC | Motiva Enterprises LLC | |
| Motiva Enterprises Waco Blending Terminal | Terminal | TX | Motiva Enterprises LLC | |
| Motus T1 LLC terminal | Terminal | TX | Motus T1 LLC | |
| Motus T2 LLC terminal | Terminal | TX | Motus T2 LLC | |
| Mount Pearl Gas Plant | Gas processing plant | Cheyenne County, CO | Citation Oil & Gas Corp | In service |
| Mountain States Asphalt Tooele terminal | Terminal | UT | Mountain States Asphalt Inc | |
| Mountain V, LLC, Alexander Station | Compressor station | WV | | |
| Mountain Valley Pipeline, LLC, Bradshaw Station | Compressor station | WV | | |
| Mountain Valley Pipeline, LLC, Harris Station | Compressor station | WV | | |
| Mountain Valley Pipeline, LLC, Stallworth Station | Compressor station | WV | | |
| Mountrail Terminal | Terminal | ND | | |
| Mt. Olive Plant | Gas processing plant | Lincoln Parish, LA | ETC PennTex LLC | In service |
| Mudge CDP | Compressor station | NM | Hilcorp Energy Company | |
| Muldon | Underground storage | Monroe County, MS | Southern Natural Gas Company, L.L.C. | In service |
| Muldraugh | Underground storage | Meade County, KY | Louisville Gas & Electric Co | In service |
| Murdock A 1 Compressor Station | Compressor station | Texas County, OK | Merit Energy Company | |
| Murphy Compressor Station | Compressor station | Garfield County, OK | ET Gathering & Processing, LLC | |