| Code | Name | Region |
|---|---|---|
| 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 |
| USWIH | Willapa | WA |
| USIWL | Willard | MO |
| USZWJ | Willard | NM |
| USWLA | Willard | OH |
| USWUG | Whittington | IL |
| USW2L | Whitwell | TN |
| USICT | Wichita | KS |
| USSPS | Wichita Falls | TX |
| USAPW | Wickenburg | AZ |
| USWCP | Wicker Park | IL |
| USIKC | Wickett | TX |
| USWKY | Wickliffe | KY |
| USWIC | Wickliffe | OH |
| USWC4 | Wicomico Church | VA |
| USIDR | Widener | AR |
| USWGG | Wiggins | CO |
| USGGI | Wiggins | MS |
| USWI3 | Wilber | NE |
| US5WR | Wilbraham | MA |
| USXNN | Wilburton | OK |