| Code | Name | Region |
|---|---|---|
| USGIF | Winter Haven | FL |
| USWIP | Winter Park | CO |
| USWPK | Winter Park | FL |
| USZIW | Winter Springs | FL |
| US8WE | Wintergreen | VA |
| USTVA | Winterhaven | CA |
| USWIE | Winterport | ME |
| USIES | Winters | CA |
| USIZR | Winters | TX |
| USWNT | Winterset | IA |
| USWQZ | Wintersville | OH |
| USWRP | Winterthur | DE |
| USWNL | Winterville | GA |
| USTRW | Winterville | NC |
| USWT9 | Winthrop | AR |
| USQW2 | Winnetka | CA |
| USZTK | Winnetka | IL |
| USWFN | Winnfield | LA |
| USWXE | Winnie | TX |
| USWYL | Winnsboro | LA |
| USWNB | Winnsboro | SC |
| USWJJ | Winnsboro | TX |
| USWI5 | Winokur | GA |
| USONA | Winona | MN |
| USWN7 | Winona | MS |
| USWN9 | Winona | TX |
| USWNK | Winooski | VT |
| USINW | Winslow | AZ |
| USWW7 | Winslow | IL |
| USWSE | Winslow | ME |
| US6NJ | Winslow | NJ |
| USWNS | Winsted | CT |
| USWJN | Winsted | MN |
| USVSN | Winston | GA |
| US8AN | Winston | MT |
| USNFV | Winfield | IL |
| USWLD | Winfield | KS |
| USWFV | Winfield | PA |
| USWXF | Winfield | TN |
| USINF | Winfield | TX |
| USWF9 | Winfield | WV |
| USXWG | Wingate | NC |
| USWGX | Wingate | TX |
| USIGP | Wingdale | NY |
| USWJ2 | Winger | MN |
| USINK | Wink | TX |
| USWQW | Winlock | WA |
| US3NN | Winn | ME |
| USWQM | Winn | MI |
| USWNN | Winnebago | IL |