| - | - | Lowell | Lowell | |
| - | - | Lowell City | Lowell | |
| - | - | Lower Granite State | Colfax | |
| - | - | Lower Monumental State | Kahlotus | |
| UBS | KUBS | Lowndes County Airport | Columbus | |
| - | - | Lubec Municipal | Lubec | |
| - | - | Lucas | Lucas | |
| - | KERY | Luce Co | Newberry | |
| - | - | Lufker | East Moriches | |
| LFK | KLFK | Lufkin Angelina County Airport | Nacogdoches | |
| - | - | Lumpkin Co-Wimpy'S | Dahlonega | |
| - | - | Lunenburg Co | Kenbridge | |
| - | - | Luray Caverns | Luray | |
| LSK | KLSK | Lusk Municipal | Lusk | |
| - | - | Luther | Chittenango | |
| - | - | Lynden | Lynden | |
| - | - | Lyon | Thornwell | |
| - | - | Lyons | Rainsville | |
| PLK | KPLK | M Graham Clark Airport | Branson/Point Lookout | |
| - | - | Maben | Lexington & Prattsville | |
| RMC | - | Machesney Airport | Rockford | |
| - | KMVM | Machias-Valley | Machias | |
| - | - | Mack Mesa | Mack | |
| HFF | KHFF | Mackall Army Air Field | Hoffman | |
| - | - | Mackay | Mackay | |
| - | - | Mackinac Co | St Ignace | |
| - | - | Macomb | New Haven | |
| MQB | KMQB | Macomb Municipal Airport | Macomb | |
| MAC | KMAC | Macon Downtown Airport | Macon | |
| - | - | Macon Municipal | Macon | |
| - | - | Mad River | Tremont City | |
| - | - | Maddock Municipal | Maddock | |
| - | - | Madeline I | La Pointe | |
| - | - | Madill Municipal | Madill | |
| MPE | - | Madison Airport | Madison | |
| XMD | KMDS | Madison Airport | Madison | |
| - | KUYF | Madison Co | London | |
| - | - | Madison Co Executive | Huntsville | |
| - | - | Madison Municipal | Madison | |
| - | KIMS | Madison Municipal Airport | Madison | |
| - | KDXX | Madison-Lac Qui Parle Co | Madison | |
| - | - | Madisonville Municipal | Madisonville | |
| - | - | Madisonville Municipal | Madisonville | |
| MDJ | - | Madras City-County Airport | Madras | |
| - | - | Magdalena Municipal | Magdalena | |
| - | - | Magee | Coeur D'Alene | |
| LOZ | KLOZ | Magee Field | London | |
| - | - | Magee Municipal | Magee | |
| - | - | Magic Reservoir | Hailey | |
| AGO | KAGO | Magnolia Municipal Airport | Magnolia | |