| Meyers Chuck Seaplane Base | Meyers Chuck | WMK | 1 |
| Miami Municipal Airport | Miami | MIO · KMIO | 1 |
| Miami Seaplane Base | Miami | MPB | 1 |
| Miami University Airport | Oxford | OXD · KOXD | 1 |
| Michael AAF (Dugway Proving Ground) Airport | Dugway Proving Ground | DPG · KDPG | 1 |
| Mid-Carolina Regional Airport | Salisbury | SRW · KRUQ | 1 |
| Mid-State Regional Airport | Philipsburg | PSB · KPSB | 2 |
| MidCoast Regional Airport at Wright Army Airfield | Hinesville | LIY · KLHW | 4 |
| Middleton Island Airport | Middleton Island | MDO · PAMD | 2 |
| Middletown Regional Airport | Middletown | MWO · KMWO | 2 |
| Midland Airpark | Midland | MDD · KMDD | 2 |
| Mifflin County Airport | Reedsville | RED · KRVL | 1 |
| Milford Municipal-Ben and Judy Briscoe Field | Milford | MLF · KMLF | 1 |
| Millard Airport | Omaha | MIQ · KMLE | 1 |
| Millinocket Municipal Airport | Millinocket | MLT · KMLT | 2 |
| Minden-Tahoe Airport | Minden | MEV · KMEV | 3 |
| Minute Man Air Field | Stow | MMN | 2 |
| Mitchell Municipal Airport | Mitchell | MHE · KMHE | 2 |
| Mondell Field | Newcastle | ECS · KECS | 1 |
| Monmouth Executive Airport | Belmar/Farmingdale | BLM · KBLM | 2 |
| Monroe County Aeroplex Airport | Monroeville | MVC · KMVC | 1 |
| Montague-Yreka Rohrer Field | Montague | ROF | 2 |
| Montevideo Chippewa County Airport | Montevideo | MVE · KMVE | 2 |
| Montgomery County Airpark | Gaithersburg | GAI · KGAI | 1 |
| Montgomery-Gibbs Executive Airport | San Diego | MYF · KMYF | 3 |
| Monticello Airport | Monticello | MXC | 0 |
| Monticello Regional Airport | Monticello | MXO · KMXO | 2 |
| Monument Valley Airport | Oljato-Monument Valley | GMV | 1 |
| Moore County Airport | Carthage | SOP · KSOP | 1 |
| Morris Municipal Airport Charlie Schmidt Field | Morris | MOX · KMOX | 2 |
| Morristown Regional Airport | Morristown | MOR · KMOR | 1 |
| Morrisville-Stowe State Airport | Morrisville | MVL · KMVL | 1 |
| Moses Point Airport | Elim | MOS | 1 |
| Moultrie Municipal Airport | Moultrie | MGR · KMGR | 2 |
| Mount Pleasant Municipal Airport | Mount Pleasant | MOP · KMOP | 2 |
| Mount Pleasant Municipal Airport | Mount Pleasant | MPZ · KMPZ | 2 |
| Mount Pleasant Regional Airport | Mount Pleasant | MPS · KOSA | 1 |
| Mount Vernon Outland Airport | Mount Vernon | MVN · KMVN | 2 |
| Mount Washington Regional Airport | Whitefield | HIE · KHIE | 1 |
| Murray-Calloway County Airport Kyle-Oakley Field | Murray | CEY · KCEY | 1 |
| Muscatine Municipal Airport | Muscatine | MUT · KMUT | 2 |
| Muskogee-Davis Regional Airport | Muskogee | MKO · KMKO | 3 |
| Naknek Airport | Naknek | NNK | 3 |
| Napa County Airport | Napa | APC · KAPC | 3 |
| Nashua Airport / Boire Field | Nashua | ASH · KASH | 1 |
| Natchez–Adams County Airport / Hardy-Anders Field | Natchez | HEZ · KHEZ | 2 |
| National Wildlife Refuge Airport | Matagorda Island | MGI | 0 |
| Naval Outlying Field Barin | Foley | NHX · KNBJ | 2 |
| Naval Outlying Field Imperial Beach (Ream Field) | Imperial Beach | NRS · KNRS | 2 |
| Neil Armstrong Airport | Wapakoneta | AXV · KAXV | 1 |
| Neosho Hugh Robinson Airport | Neosho | EOS · KEOS | 1 |
| Nervino Airport | Beckwourth | NVN | 1 |
| Nevada Municipal Airport | Nevada | NVD · KNVD | 2 |
| New Century AirCenter Airport | New Century | JCI · KIXD | 2 |
| New Coalinga Municipal Airport | Coalinga | CLG | 2 |
| New River Valley Airport | Dublin | PSK · KPSK | 1 |
| New Ulm Municipal Airport | New Ulm | ULM · KULM | 2 |
| Newton City-County Airport | Newton | EWK · KEWK | 2 |
| Newton Municipal Airport | Newton | TNU · KTNU | 1 |
| Ninilchik Airport | Ninilchik | NIN | 1 |
| Nondalton Airport | Nondalton | NNL · PANO | 1 |
| North Central State Airport | Pawtucket | SFZ · KSFZ | 2 |
| North Fork Valley Airport | Paonia | WPO | 1 |
| Northeast Alabama Regional Airport | Gadsden | GAD · KGAD | 1 |
| Northeast Kingdom International Airport | Newport | EFK · KEFK | 2 |
| Northeastern Regional Airport | Edenton | EDE · KEDE | 1 |
| Northern Aroostook Regional Airport | Frenchville | WFK · KFVE | 1 |
| Nyac Airport | Nyac | ZNC | 1 |
| O'Neal Airport | Lawrenceville | OEA | 3 |
| O'Neill Municipal Airport–John L Baker Field | O'Neill | ONL · KONL | 2 |
| Oakdale Airport | Oakdale | ODC | 1 |
| Ocala International Airport - Jim Taylor Field | Ocala | OCF · KOCF | 2 |
| Ocean County Airport | Toms River | MJX · KMJX | 2 |
| Oconee County Regional Airport | Clemson | CEU · KCEU | 1 |
| Odessa Schlemeyer Field | Odessa | ODT | 3 |
| Ogallala Municipal Airport Searle Field | Ogallala | OGA · KOGA | 2 |
| Ohio University Airport | Albany | ATO · KUNI | 1 |
| Ohkay Owingeh Airport | Espanola | ESO | 1 |
| Okeechobee County Airport | Okeechobee | OBE · KOBE | 2 |
| Okmulgee Regional Airport | Okmulgee | OKM · KOKM | 1 |
| Oliktok Point Long Range Radar Station Airport | Oliktok Point | POLI | 0 |
| Olive Branch Airport | Olive Branch | OLV · KOLV | 1 |
| Olney Municipal Airport | Olney | ONY · KONY | 3 |
| Olney Noble Airport | Olney-Noble | OLY · KOLY | 2 |
| Omak Airport | Omak | OMK · KOMK | 1 |
| Omar N Bradley Airport | Moberly | MBY · KMBY | 2 |
| Orange County Airport | Montgomery | MGJ · KMGJ | 2 |
| Oroville Municipal Airport | Oroville | OVE · KOVE | 2 |
| Oscoda Wurtsmith Airport | Oscoda | OSC · KOSC | 1 |
| Oskaloosa Municipal Airport | Cedar | OOA · KOOA | 2 |
| Owatonna Degner Regional Airport | Owatonna | OWA · KOWA | 1 |
| Ozona Municipal Airport | Ozona | OZA · KOZA | 1 |
| Pacific City State Airport | Pacific City | PFC · KPFC | 1 |
| Palacios Municipal Airport | Palacios | PSX · KPSX | 3 |
| Palestine Municipal Airport | Palestine | PSN · KPSN | 2 |
| Palm Beach County Glades Airport | Pahokee | PHK · KPHK | 1 |
| Palm Beach County Park Airport | West Palm Beach | LNA · KLNA | 3 |
| Panguitch Municipal Airport | Panguitch | PNU | 1 |
| Paradise Skypark Airport | Paradise | PYS | 1 |
| Park Falls Municipal Airport | Park Falls | PKF · KPKF | 1 |