| Code | Name | Region |
|---|---|---|
| USTWO | Wurtsboro | NY |
| USWYC | Wyalusing | PA |
| USXWY | Wyandanch | NY |
| USWYD | Wyandotte | MI |
| USYAE | Wyanet | IL |
| USW7C | Worcester | VT |
| USWI2 | Worden | IL |
| USWRL | Worland | WY |
| US6OC | Woronoco | MA |
| USWRH | Worth | IL |
| USWRX | Wortham | TX |
| USW8D | Worthing | SD |
| USJTI | Worthington | IN |
| USW4T | Worthington | KY |
| USOTG | Worthington | MN |
| USWGH | Worthington | OH |
| USVWH | Worthington | PA |
| USZWG | Worthington | WV |
| USOHT | Worthington Center | MA |
| USWG4 | Worthington Springs | FL |
| USWO8 | Worton | MD |
| USWRG | Wrangell | AK |
| USW5R | Wray | CO |
| USWRJ | Wray | GA |
| USWN2 | Wren | MS |
| USWOE | Woodville | MS |
| USWV4 | Woodville | OH |
| USWV7 | Woodville | TX |
| USWJV | Woodville | WI |
| USUWW | Woodward | IA |
| USWWR | Woodward | OK |
| USDWY | Woodway | TX |
| USWUF | Woodway | WA |
| USW2W | Woodworth | LA |
| USYWR | Woolrich | PA |
| US8WW | Woolwich | ME |
| USW4W | Woolwich Township | NJ |
| USSFN | Woonsocket | RI |
| USOSK | Woonsocket | SD |
| USOEF | Woorburn | KY |
| USBJJ | Wooster | OH |
| USW3C | Worcestar | MA |
| USORH | Worcester | MA |
| USWOC | Worcester | NY |
| USKOW | Worcester | PA |
| USDBK | Woodsboro | TX |
| USW5F | Woodsfield | OH |
| USWDZ | Woodside | CA |
| USWD5 | Woodside | DE |
| USWOS | Woodside/queens/new York | NY |