| Code | Name | Region |
|---|---|---|
| USTJA | Natoma | KS |
| USNRM | Natrium | WV |
| USNAH | Natrona Heights | PA |
| USNAT | Natural Bridge | NY |
| USNLH | Natural Bridge | VA |
| USHPC | Natural Bridge Station | VA |
| USNGK | Naugatuck | CT |
| USNKI | Naukiti | AK |
| USNAV | Nauvoo | AL |
| USNV7 | Nauvoo | IL |
| USNVA | Navarre | FL |
| USNVF | Navarre | OH |
| USVSA | Navasota | TX |
| USNIJ | Nawiliwili | HI |
| USNAZ | Nazareth | PA |
| USNEB | Neah Bay | WA |
| US7NO | Nebo | KY |
| USEBO | Nebo, Mcdowell | NC |
| USNSH | Nashville | GA |
| USNXV | Nashville | IL |
| 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 |