| Code | Name | Region |
|---|---|---|
| USNBV | North Bay Shore | NY |
| USNDQ | Norden | CA |
| USNFF | Norfolk | CT |
| USNFJ | Norfolk | MA |
| USOFK | Norfolk | NE |
| USNFK | Norfolk | NY |
| USORF | Norfolk | VA |
| USOOJ | Norfork | AR |
| USNRL | Norlina | NC |
| USDMV | Norma | NJ |
| USNOM | Normal | IL |
| US4OR | Normalville | PA |
| USNMN | Norman | AR |
| USNI2 | Norman | IN |
| USOUN | Norman | OK |
| USNZM | Norman Park | GA |
| US5UN | Normandy | MO |
| USNXK | Normandy | TN |
| USNMG | Normangee | TX |
| USNFA | Norphlet | AR |
| USNRF | Norridge | IL |
| USNTX | Nocona | TX |
| USNOE | Noel | MO |
| USOLS | Nogales | AZ |
| USQNV | Nokesville | VA |
| USNQM | Nokomis | FL |
| USNLZ | Nolan | TX |
| USNVX | Nolanville | TX |
| USNZV | Nolensville | TN |
| USOME | Nome | AK |
| USNMX | Nome | TX |
| USNNL | Nondalton | AK |
| USKKE | Nooksack | WA |
| USNOO | Noonan | ND |
| USORV | Noorvik | AK |
| USOIU | Nora Springs | IA |
| USNQO | Norco | CA |
| USNCM | Norco | LA |
| USUXN | Norcross | GA |
| USNS9 | Norcross | MN |
| USNCX | Norcross | VA |
| USNIY | Ninety Six | SC |
| USN2E | Nineveh | IN |
| USNIN | Ninilchik | AK |
| USNN3 | Ninnekah | OK |
| USN5B | Niobrara | NE |
| USNIA | Niota | TN |
| USNIO | Nipomo | CA |
| USNP5 | Nipton | CA |
| USIYF | Niskayuna | NY |