| Code | Name | Region |
|---|---|---|
| USWMS | Williamstown | MA |
| USWZJ | Williamstown | NJ |
| USZJM | Williamstown | NY |
| USWZP | Williamstown | PA |
| USXWW | Williamstown | VT |
| USYWS | Williamstown | WV |
| USIIA | Williamsville | NY |
| USXZW | Willianstown | NY |
| USQWL | Willimantic | CT |
| USWLO | Willingboro | NJ |
| USIGV | Willington | CT |
| USZFU | Willington | SC |
| USIIS | Willis | MI |
| USWYX | Willis | TX |
| USW8K | Willisburg | KY |
| USR6T | Willard | UT |
| USICX | Willcox | AZ |
| USIFM | Williams | AZ |
| USIIW | Williams | CA |
| USIMS | Williams | MN |
| USWL7 | Williams | OR |
| USWIA | Williams | TX |
| US3AY | Williams Bay | WI |
| USWUS | Williamsburg | IA |
| USWBK | Williamsburg | KY |
| USIMU | Williamsburg | MA |
| USQWZ | Williamsburg | MI |
| USWUZ | Williamsburg | OH |
| USW54 | Williamsburg | PA |
| USWLG | Williamsburg | VA |
| USWGY | Williamsburg/brooklyn/new York | NY |
| USWDL | Williamson | GA |
| USWIS | Williamson | NY |
| USWFP | Williamsport | MD |
| US2WW | Wildersville | TN |
| USXNT | Wildes Corner | RI |
| USIOM | Wildomar | CA |
| USWWF | Wildwood | FL |
| USWQD | Wildwood | MO |
| USWWD | Wildwood | NJ |
| USIOD | Wildwood | PA |
| USWBE | Wilkes-barre | PA |
| USAVP | Wilkes-barre/scranton Apt | PA |
| USIKB | Wilkesboro | NC |
| USWKV | Wilkesville | OH |
| USWIK | Wilkins | SC |
| USW4K | Wilkinsburg | PA |
| USWKM | Wilkinsonville | MA |
| USYWA | Willacoochee | GA |
| USWIR | Willamette City | OR |