| Lenora Compressor Station | Compressor station | Dewey County, OK | Cascade Pipeline | |
| Lenox | Underground storage | Macomb County, MI | Consumers Energy Inc | In service |
| Lequire Compressor Station | Compressor station | Haskell County, OK | ET Gathering & Processing, LLC | |
| Leroy | Underground storage | Uinta County, WY | Questar Pipeline | In service |
| Leroy Compressor Station | Compressor station | Beaver County, OK | DCP Operating Company, LP | |
| Lewis Run Gas Plant | Gas processing plant | McKean County, PA | Elkhorn Gas Processing | In service |
| Lexington | Underground storage | Mclean County, IL | Nicor | In service |
| Lexington Compressor Station | Compressor station | Cleveland County, OK | Enerfin Gathering LLC | |
| Libby Gas Plant | Gas processing plant | NM | DKL Field Services, LLC | |
| Liberty Compressor Station | Compressor station | Woods County, OK | Targa Pipeline Midcontinent Westok LLC | |
| Liberty Gas Plant | Gas processing plant | Liberty County, TX | | |
| Liberty North | Underground storage | Montgomery County, KS | Atmos Energy Inc | In service |
| Lick Branch Unit Enhanced Oil | Underground storage | Scott County, TN | Fork Ridge Energy | |
| Lightburn Extraction Plant | Gas processing plant | Lewis County, WV | Dominion Energy Transmission Co | In service |
| Lightning Compressor Station | Compressor station | Stephens County, OK | DCP Operating Company, LP | |
| Lignite Gas Plant | Gas processing plant | Burke County, ND | Steel Reef | |
| Lignite Natural Gas Processing Plant | Gas processing plant | Burke County, ND | ONEOK Inc., Steel Reef | In service |
| Lilli Gas Processing Facility | Gas processing plant | Weld County, CO | Noble Midstream Services, LLC | In service |
| Limestone Ridge Compressor Station | Compressor station | Latimer County, OK | Petrolink Energy LLC | |
| Limestone South Compressor Station | Compressor station | Latimer County, OK | Petrolink Energy LLC | |
| Limestone Storage | Underground storage | Cattaraugus County, NY | National Fuel Gas Supply Corporation | In service |
| Linam Gathering System | Gas processing plant | NM | DCP Operating Company, LP | |
| Linam Ranch | Gas processing plant | Lea County, NM | DCP Operating Company, LP | In service |
| Lincoln Booster Station | Compressor station | Blaine County, OK | DCP Operating Company, LP | |
| Lincoln Compressor Station | Compressor station | Kingfisher County, OK | ET Gathering & Processing, LLC | |
| Lincoln Gas Plant | Gas processing plant | Kingfisher County, OK | Bce-Mach III Midstream Holdings LLC | |
| Lincoln Parish Plant | Gas processing plant | Lincoln Parish, LA | ETC PennTex LLC | In service |
| Lincoln Storage Field | Underground storage | Logan County, IL | Ameren Illinois Company | In service |
| Lincoln Terminal Company Natchez | Terminal | MS | Lincoln Terminal Company | |
| Lincoln-Freeman | Underground storage | Clare County, MI | ANR Pipeline Company | In service |
| Linda Marie Compressor Station | Compressor station | Custer County, OK | Oneok Field Services Inc | |
| Lindsay Booster Station | Compressor station | Garvin County, OK | Oneok Field Services Inc | |
| Lindsay Bradley Compressor Station | Compressor station | Grady County, OK | DCP Operating Company, LP | |
| Lindsay CO2 Plant | Gas processing plant | Garvin County, OK | Daylight Petroleum LLC | |
| Lindsay Compressor Station | Compressor station | Garvin County, OK | DCP Operating Company, LP | |
| Lindsay Panther Creek Compressor Station | Compressor station | Garvin County, OK | DCP Operating Company, LP | |
| Linx Main & B | Gas processing plant | Carson County, TX | | |
| Lion Compressor Station | Compressor station | Grady County, OK | ET Gathering & Processing, LLC | |
| Lion Oil Memphis terminal | Terminal | TN | Lion Oil CO | |
| Lion Oil Nashville terminal | Terminal | TN | Lion Oil CO | |
| Little Beaver | Gas processing plant | ND | ONEOK Inc. | |
| Little Buffalo Basin Gas Plant | Gas processing plant | WY | | |
| Little Capon | Underground storage | Hampshire County, WV | Hampshire Gas Co | In service |
| Little Knife Gas Plant | Gas processing plant | Billings County, ND | Petro Hunt L.l.c. | In service |
| Little Stinker 2 CDP | Compressor station | NM | Hilcorp Energy Company | |
| Livingston Compressor Station | Compressor station | Caddo County, OK | ET Gathering & Processing, LLC | |
| Loan Asset Issuer LLC, Series 2021 NG-1, Sand Hill 27 | Gas processing plant | WV | | |
| Lobo I Plant | Gas processing plant | Loving County, TX | Delaware G&p LLC | In service |
| Lobo II Plant | Gas processing plant | Loving County, TX | Delaware Processing LLC | In service |
| Lodi | Underground storage | San Joaquin County, CA | Lodi Gas Storage, LLC | In service |