| Code | Name | Region |
|---|---|---|
| USW5L | Wilson | WY |
| USWV8 | Wilsonville | AL |
| USWL9 | Wilsonville | IL |
| USWJX | Wilsonville | OR |
| USUWO | Wilton | CA |
| USYIP | Willow Run Apt/detroit | MI |
| USIWS | Willow Spring | NC |
| USWZG | Willow Springs | IL |
| USZWO | Willow Springs | MO |
| US5WS | Willow Street | PA |
| USWIW | Willow Wood | OH |
| USWVW | Willowbrook | CA |
| USWOP | Willowbrook, Dupage | IL |
| USWLW | Willows | CA |
| USWPB | Wills Point | NJ |
| USILS | Wills Point | TX |
| USWSI | Willsboro | NY |
| USVAW | Willston | VA |
| USWMA | Wilma | WA |
| USWXR | Wilmer | TX |
| USIME | Wilmerding | PA |
| USXTT | Wilmette | IL |
| USWTN | Wilmington | CA |
| USILG | Wilmington | DE |
| USWQG | Wilmington | IL |
| USWIT | Williston | FL |
| USISN | Williston | ND |
| USUZN | Williston | SC |
| USWI4 | Williston | TN |
| USWIL | Williston | VT |
| USW4L | Williston Park | NY |
| USVVS | Willisville | AR |
| USWZI | Willits | CA |
| USILL | Willmar | MN |
| USLNN | Willoughby | OH |
| USWOW | Willow | AK |
| USWXL | Willow | OK |
| USWIB | Willow Brook | IL |
| USWVU | Willow Creek | CA |
| USWK8 | Willow Creek | MT |
| USNXX | Willow Grove | PA |
| USIWW | Willow Hill | PA |
| USWWY | Willow Island | WV |
| USW26 | Willow Park | TX |
| USWRU | Willow Run | MI |
| USIPT | Williamsport | PA |
| USIIM | Williamston | MI |
| USWQX | Williamston | NC |
| USWWL | Williamston | SC |
| USWS8 | Williamstown | KY |