| Code | Name | Region |
|---|---|---|
| USNCH | North Charlotte | NC |
| USNCF | North Chelmsford | MA |
| USNTA | North Chicago | IL |
| USN8C | North Chili | NY |
| USNXY | North City | WA |
| USNCR | North Clarendon | VT |
| USNC4 | North College Hill | OH |
| USNRN | North Collins | NY |
| USNC5 | North Conway | NH |
| USNCV | North Cove | NC |
| US2NC | North Creek | NY |
| USN99 | North Bay Village | FL |
| USN4B | North Beach | MD |
| USNLM | North Bellmore | NY |
| USNID | North Bend | NE |
| USNND | North Bend | OH |
| USOTH | North Bend | OR |
| USND9 | North Bend | PA |
| USNOB | North Bend | WA |
| USNTB | North Bennington | VT |
| USNBN | North Bergen | NJ |
| USNBM | North Berwick | ME |
| USTDJ | North Bethesda | MD |
| USNBA | North Billerica | MA |
| USG8H | North Birmingham | AL |
| USRHB | North Blenheim | NY |
| USRTM | North Bloomfield | OH |
| US9NB | North Bonneville | WA |
| USFHB | North Branch | MI |
| USNB2 | North Branch | MN |
| USXJN | North Branch | NJ |
| USOWK | Norridgewock | ME |
| USOZS | Norris | IL |
| USNR9 | Norris | SC |
| USNIQ | Norris | TN |
| USUXQ | Norristown | PA |
| USNRR | North | NY |
| USNOR | North | SC |
| USNAA | North Abington | MA |
| USNA9 | North Adams | MA |
| USXJM | North Andover | MA |
| USNHS | North Anson | ME |
| USJRB | North Arab | AL |
| USNJT | North Arlington | NJ |
| USNTT | North Attleboro | MA |
| USNAU | North Augusta | SC |
| USNOA | North Aurora | IL |
| USNBY | North Babylon | NY |
| USNBH | North Baltimore | OH |
| US5NB | North Barrington | IL |