| WPO | - | North Fork Valley Airport | Paonia | |
| - | - | North Little Rock Municipal | Little Rock | |
| - | - | North Omaha Airport | Omaha | |
| - | - | North Palm Beach Co Gen Avn | West Palm Beach | |
| JNH | - | North Park Inn Heliport | Dallas | |
| HWO | KHWO | North Perry Airport | Hollywood | |
| - | - | North Pickens | Reform | |
| NGC | - | North Rim Airport | Grand Canyon | |
| UMB | - | North Shore Airport | Umnak Island | |
| - | KOVO | North Vernon Airport | North Vernon | |
| - | - | North Windham | Londonderry | |
| - | - | Northampton | Northampton | |
| OHC | - | Northeast Cape Air Force Station | Northeast Cape | |
| THA | KTHA | Northern Airport | Tullahoma | |
| - | - | Northome Municipal | Northome | |
| - | - | Northumberland Co | Shamokin | |
| ORT | PAOR | Northway Airport | Northway | |
| - | - | Northwest Regional | Roanoke | |
| - | - | Northwood Mun-Vince | Northwood | |
| - | - | Northwood Municipal | Northwood | |
| - | KNRN | Norton Municipal | Norton | |
| ORQ | - | Norwalk Heliport | Norwalk | |
| - | - | Norwalk Huron County Airport | Norwalk | |
| - | - | Norwich | Norwich | |
| - | - | Nowata Municipal | Nowata | |
| - | - | Nueces Co | Robstown | |
| ZNC | - | Nyac Airport | Nyac | |
| ODW | - | Oak Harbor Airport | Oak Harbor | |
| - | - | Oakdale | Oakdale | |
| - | - | Oakes Municipal | Oakes | |
| - | - | Oakland/Troy | Troy | |
| - | - | Oakley Municipal | Oakley | |
| - | KOEL | Oakley Municipal | Oakley | |
| - | - | Oakridge State | Oakridge | |
| - | KOIN | Oberlin Municipal | Oberlin | |
| - | - | Obie | Chinook | |
| - | - | Ocean City Municipal | Ocean City | |
| - | - | Ocean Isle | Ocean Isle Beach | |
| - | - | Ocean Ridge | Gualala | |
| - | - | Ocean Shores Municipal | Ocean Shores | |
| - | - | Ocean Springs | Ocean Springs | |
| - | - | Oceana Co | Hart/Shelby | |
| OCI | - | Oceanic Airport | Oceanic | |
| - | - | Oceano Co | Oceano | |
| OCN | KOKB | Oceanside Municipal Airport | Oceanside | |
| - | KOCQ | Oconto Municipal | Oconto | |
| - | - | Ocotillo | Ocotillo Wells | |
| - | - | Ocracoke I | Ocracoke | |
| - | - | Odessa Municipal | Odessa | |
| - | KOLZ | Oelwein Municipal | Oelwein | |