| Code | Name | Region |
|---|---|---|
| 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 |
| USYWI | Wilcox | PA |
| USWIJ | Wilder | ID |
| USWII | Wilder | KY |
| USVTD | Wilder | VT |
| US5WH | Whiting | VT |
| USWTI | Whiting | WI |
| US7WG | Whitingham | VT |
| USWXM | Whitinsville | MA |
| USWHL | Whitlash | MT |
| USW2K | Whitley City | KY |
| USWJI | Whitlock | TN |
| USWQA | Whitman | MA |
| USIAQ | Whitman | WV |
| USIWM | Whitmire | SC |
| USWMP | Whitmore Lake | MI |
| USWHK | Whitner | KY |
| USWT5 | Whitney | TX |
| USITE | Whitsett | NC |
| USWT6 | Whitsett | TX |
| USW4M | Whittemore | IA |
| USITM | Whittemore | MI |
| USWQF | Whittier | AK |
| USWHR | Whittier | CA |
| USVHT | Whittier | NC |
| USWC5 | Whites Creek | TN |
| USWH2 | Whitesboro | NY |
| USWH8 | Whitesboro | TX |
| USBRG | Whitesburg | KY |
| USXWH | Whitesburg | TN |
| USZWS | Whitestone | GA |