- Grand Forks (RDR)
- Greenville (GMU)
- Greenwood (GWO)
- Groton (GON)
- Gulkana (GKN)
- Guymon (GUY)
- Hampton (LFI)
- Hana (HNM)
- Harrison (HRO)
- Hartford (HFD)
- Hattiesburg (HBG)
- Hayward (HYR)
- Hickory (HKY)
- Hobart (HBR)
- Hollywood (HWO)
- Holy Cross (HCR)
- Homestead (HST)
- Hoquiam (HQM)
- Houlton (HUL)
- Houston (CXO)
- Houston (EFD)
- Houston (SGR)
- Huntsville (HTV)
- Huron (HON)
- Hutchinson (HUT)
- Jackson (JXN)
- Jacksonville (CRG)
- Jacksonville (LRF)
- Jacksonville (NIP)
- Jacksonville (NRB)
- Jacksonville (VQQ)
- Jamestown (JHW)
- Jonesboro (JBR)
- Junction (JCT)
- Kaneohe (NGF)
- Kankakee (IKK)
- Kansas City (MKC)
- Kapolei (JRF)
- Kaunakakai (MKK)
- Keene (EEN)
- Kekaha (BKH)
- Kelso (KLS)
- Kenosha (ENW)
- Key Largo (OCA)
- Key West (NQX)
- Kiana (IAN)
- Kingman (IGM)
- Kingsville (NQI)
- Kinston (ISO)
- Kirksville (IRK)
- Klamath Falls (LMT)
- Knob Noster (SZL)
- Lahaina (JHM)
- Lake Havasu City (HII)
- Lakehurst (NEL)
- Lakeland (LAL)
- Lamar (LAA)
- Lancaster (WJF)
- Lander (LND)
- Las Cruces (LRU)
- Las Vegas (LSV)
- Las Vegas (LVS)
- Las Vegas (VGT)
- Latrobe (LBE)
- Lawrence (LWM)
- Leesburg (LEE)
- Lemoore (NLC)
- Lewistown (LWT)
- Livingston (LVM)
- Logan (LGU)
- Lompoc (VBG)
- London (LOZ)
- Louisville (LOU)
- Loveland (FNL)
- Lovelock (LOL)
- Lufkin (LFK)
- Lumberton (LBT)
- Mammoth Lakes (MMH)
- Manassas (MNZ)
- Mansfield (MFD)
- Marathon (MTH)
- Marietta (MGE)
- Marion (MWA)
- Martinsburg (MRB)
- Marysville (MYV)
- Massena (MSS)
- Mc Alester (MLC)
- McCall (MYL)
- McComb (MCB)
- McGrath (MCG)
- Merced (MCE)
- Merced (MER)
- Mercury (DRA)
- Mesquite (MFH)
- Metlakatla (ANN)
- Miami (OPF)
- Miami (TMB)
- Michigan City (MGC)
- Miles City (MLS)
- Millington (NQA)
- Millville (MIV)
- Milton (NSE)
- Mineral Wells (MWL)
- Minot (MIB)
- Mobile (BFM)
- Mobridge (MBG)
- Modesto (MOD)
- Mojave (MHV)
- Montgomery (MXF)
- Morristown (MMU)
- Moses Lake (MWH)
- Mount Clemens (MTC)
- Mountain Home (MUO)
- Mountain Home (WMH)
- Mountain View (NUQ)
- Muncie (MIE)
- Murphysboro (MDH)
- Naples (APF)
- Needles (EED)
- Nenana (ENN)