| - | - | Lee Vining | Lee Vining | |
| - | - | Leeds Municipal | Leeds | |
| - | - | Leesville | Leesville | |
| - | WS51 | Leeward Farm | Soldiers Grove | |
| GWO | KGWO | Leflore Airport | Greenwood | |
| - | - | Leland | Leland | |
| LRJ | KLRJ | Lemars Municipal Airport | Lemars | |
| LEM | KLEM | Lemmon Airport | Lemmon | |
| ADG | KADG | Lenawee County Airport | Adrian | |
| - | - | Lenhardt | Hubbard | |
| MRN | KMRN | Lenoir Airport | Morganton | |
| - | KS03 | Lenora Municipal | Lenora | |
| - | - | Leon | Leon | |
| - | - | Leonard Municipal | Leonard | |
| - | - | Levelland Municipal | Levelland | |
| CDK | KCDK | Lewis Airport | Cedar Key | |
| - | - | Lewis Co Regional | Monticello | |
| - | - | Lewis Ranch | Leakey | |
| - | - | Lexington | Lexington | |
| - | - | Lexington Co | Gaston | |
| - | - | Lexington Municipal Airport | Lexington | |
| - | - | Li Calzi | Bridgeton | |
| - | - | Libby | Libby | |
| - | - | Liberty Co | Hinesville | |
| - | - | Liberty Co | Chester | |
| - | - | Liberty Municipal Airport | Liberty | |
| - | - | Liberty-Casey Co | Liberty | |
| - | - | Lida Junction | Goldfield | |
| - | - | Lidgerwood Municipal | Lidgerwood | |
| - | - | Lignite | Lignite | |
| LVD | - | Lime Village Airport | Lime Village | |
| - | - | Limington-Harmon | Limington | |
| LIC | KLIC | Limon Municipal Airport | Limon | |
| - | - | Lincoln | Lincoln | |
| - | - | Lincoln Co | Panaca | |
| - | - | Lincoln Municipal | Lincoln | |
| - | - | Lincoln Park | Lincoln Park | |
| - | KLRG | Lincoln Regional | Lincoln | |
| - | KLHM | Lincoln Regional/Harder | Lincoln | |
| - | KIPJ | Lincolnton-Lincoln Co | Lincolnton | |
| - | - | Lind | Lind | |
| - | - | Lindberg | Hessel | |
| - | - | Lindrith | Lindrith | |
| - | - | Lindsay Municipal | Lindsay | |
| - | - | Linn State Tech College | Linn | |
| - | - | Linton Municipal | Linton | |
| - | - | Lisbon Municipal | Lisbon | |
| - | - | Litchfield Municipal | Litchfield | |
| - | KLJF | Litchfield Municipal | Litchfield | |
| - | KLXL | Little Falls-Morrison Co | Little Falls | |