| Code | Name | Region |
|---|---|---|
| USWXZ | Winton | CA |
| US5WT | Winton | MN |
| USTWQ | Winton | NC |
| USVWW | Wirtz | VA |
| USISS | Wiscasset | ME |
| USWNF | Wisconsin Dells | WI |
| USISW | Wisconsin Rapids | WI |
| USLNP | Wise | VA |
| USWXK | Wishek | ND |
| USWIZ | Wissahickon | PA |
| USJTR | Wister | OK |
| USW44 | Withee | WI |
| USWB2 | Wittenberg | WI |
| US4WM | Wittman | MD |
| USWTJ | Wittmann | AZ |
| USWXT | Winston | NM |
| USWQT | Winston | OR |
| USINT | Winston Salem | NC |
| USWTG | Winter Garden | FL |
| USWH5 | Winter Harbor | ME |
| 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 |