| Code | Name | Region |
|---|---|---|
| USNJH | Nashville | IN |
| USNIF | Nashville | KS |
| USVQV | Nashville | MI |
| USNAS | Nashville | NC |
| USNJV | Nashville | OH |
| USBNA | Nashville | TN |
| USDHW | Nashwauk | MN |
| USNS5 | Nasonville | RI |
| USNYU | Nassau | NY |
| USN2B | Nassau Bay | TX |
| USN8W | Nassawadox | VA |
| USHEZ | Natchez | MS |
| USNTH | Natchitoches | LA |
| USN2H | Nathrop | CO |
| USNAK | Natick | MA |
| USDCA | National Apt/washington | DC |
| USNLN | National City | CA |
| USNCI | National City | IL |
| USNX5 | Napoleon | ND |
| USNAL | Napoleon | OH |
| USNVW | Napoleonville | LA |
| USNAI | Nappanee | IN |
| USNJ3 | Naranja | FL |
| USN84 | Narberth | PA |
| USNGU | Narragansett | RI |
| USNAB | Narrows | VA |
| USNGB | Narrowsburg | NY |
| USNVO | Narvon | PA |
| USWZQ | Narvon | PA |
| USP2A | Nas Pensacola | FL |
| USNNB | Nash | TX |
| USNHC | Nash, Ellis | TX |
| US7AS | Nashotah | WI |
| USN2P | Nashport | OH |
| USN2S | Nashua | IA |
| USASH | Nashua | NH |
| USZNV | Nashville | AR |
| USN5V | Nashville | CA |
| USNHA | Naheola | AL |
| USNNH | Nahunta | GA |
| USNNK | Naknek | AK |
| USNOL | Nakolik River | AK |
| USNPA | Nampa | ID |
| USNNO | Nanticoke | MD |
| USNNC | Nanticoke | PA |
| USACK | Nantucket | MA |
| USNAE | Nanuet | NY |
| USAPC | Napa | CA |
| USWNA | Napakiak | AK |
| USNH8 | Napanoch | NY |