- Lloyd Stearman FieldIdent: 1K1Serves: Benton
- LM Ranch AirportIdent: TA93Serves: Sherman
- Lmn 120 AirportIdent: 0KS9Serves: Douglas
- Lobo FieldIdent: 30OKServes: Calvin
- Lobo Mountain Ranch AirportIdent: TE21Serves: Bandera
- Lochridge Ranch AirportIdent: TX25Serves: Athens
- Locke Lake AirportIdent: NH15Serves: Barnstead
- Locker Brothers AirportIdent: 1TE0Serves: Muleshoe
- Lockeridge AirportIdent: OI58Serves: Canton
- Lockett AirportIdent: 29TXServes: Vernon
- Lockhart AirportIdent: 2OR6Serves: Ironside
- Lockhart Municipal AirportIdent: K50RServes: Lockhart
- Lockyear AirportIdent: II89Serves: Evansville
- Lodi AirparkIdent: L53Serves: Lodi
- Lodi AirportIdent: 0SD1Serves: Wakonda
- Lodi AirportIdent: K1O3Serves: Lodi
- Lodi Lakeland AirportIdent: 9WN5Serves: Lodi
- Loeber McDaniel FieldIdent: WI50Serves: Merrimac
- Loesch Ranch AirportIdent: TS78Serves: Booker
- Lofty Redwoods AirportIdent: 53CLServes: Anchor Bay
- Log Cabin AirportIdent: WS69Serves: Naples
- Logan AirportIdent: 96COServes: Bennett
- Logan County AirportIdent: K6L4Serves: Logan
- Logan County AirportIdent: KAAAServes: Lincoln
- Logan FieldIdent: K1A4Serves: Samson
- Logan's Chance AirportIdent: 57OIServes: Lawrenceville
- Logansport Cass County AirportIdent: KGGPServes: Logansport
- Loghouse STOLportIdent: TE38Serves: Goodrich
- Logsdon Ranch AirportIdent: OK43Serves: Alva
- Logue AirportIdent: PA45Serves: Bodines
- Lola Landing AirportIdent: 36GAServes: Conyers
- Lollars Creek Farm AirportIdent: AR27Serves: Wesley
- Loma de Cometa AirportIdent: 66TXServes: Crystal City
- Loma Madera Ranch AirportIdent: 25CAServes: Santa Ysabel
- Lometa Air StripIdent: 7TE3Serves: Lometa
- Lompoc AirportIdent: KLPCServes: Lompoc
- Lone Hawk AirportIdent: 0MT9Serves: White Fish
- Lone Oaks Ranch AirportIdent: 5OR9Serves: Stayton
- Lone Pine AerodromeIdent: 34KYServes: Auburn
- Lone Pine Flying Ranch AirportIdent: WY64Serves: Thayne
- Lone Star Flying Service AirportIdent: XA41Serves: Harper
- Lone Tree Ranch AirportIdent: 35COServes: Punkin Center
- Lonesome Dove AirfieldIdent: 0LS8Serves: Woodlawn
- Lonesome FieldIdent: 1NC8Serves: Gold Hill
- Lonesome Pine AirportIdent: KLNPServes: Wise
- Lonesome Sky AirportIdent: MO24Serves: Craig
- Lonetree AirstripIdent: ND72Serves: Harvey
- Long Acre Farms AirportIdent: 23NKServes: Macedon
- Long Branch Farm AirportIdent: US-4134Serves: Baker
- Long Island AirparkIdent: NC26Serves: Catawba
- Long Island AirportIdent: US-8686Serves: Long Island
- Long Lake AirportIdent: 4AK3Serves: Long Lake
- Long Lake AirportIdent: AK69Serves: Willow
- Long Meadow AirstripIdent: TN65Serves: Murfreesburg
- Long Ranch AirportIdent: 0OR3Serves: Merrill
- Long View Landing AirportIdent: CT66Serves: Washington
- Longbell Ranch AirportIdent: 2CL3Serves: Macdoel
- Longbranch AirportIdent: VA08Serves: Kilmarnock
- Longhorn Auxiliary Landing StripIdent: 22XSServes: Fort Hood
- Longmere Lake AirstripIdent: US-2920Serves: Soldotna