| Code | Name | Region |
|---|---|---|
| USWCG | Washington Crossing | PA |
| USGSA | Washington Island | WI |
| USDWK | Warwick | GA |
| USWRC | Warwick | MA |
| USWW3 | Warwick | MD |
| USW25 | Warwick | ND |
| USWRK | Warwick | NY |
| USUZO | Warwick | RI |
| USWQS | Wasco | CA |
| USWO5 | Wasco | IL |
| USWC7 | Wasco | OR |
| USWKA | Waseca | MN |
| USHBU | Washburn | IL |
| US9BW | Washburn | ME |
| USW74 | Washburn | ND |
| USURW | Washburn | TN |
| USWZU | Washburn | WI |
| USWT3 | Washington | CA |
| USKJH | Washington | CT |
| USWAS | Washington | DC |
| USWAB | Washington | GA |
| USVTO | Washington | IA |
| USWTO | Warrenton | OR |
| USTWG | Warrenton | TX |
| USWVJ | Warrenton | VA |
| USXWV | Warrenville | IL |
| USWNI | Warrenville | NJ |
| USWZR | Warrenville | SC |
| USWRZ | Warrick | IN |
| USWRA | Warrington | PA |
| USRRP | Warrior | AL |
| USRRT | Warroad | MN |
| USWXW | Warsaw | IL |
| USWAP | Warsaw | IN |
| USWZS | Warsaw | KY |
| USWWC | Warsaw | MO |
| USWSW | Warsaw | NC |
| USARW | Warsaw | NY |
| USWWG | Warsaw | OH |
| USWR2 | Warsaw | VA |
| USWTU | Wartburg | TN |
| USWH9 | Warthen | GA |
| USWA9 | Warren | MN |
| US8WA | Warren | NH |
| USW4R | Warren | NJ |
| USY4Y | Warren | NY |
| USWRN | Warren | OH |
| USVWR | Warren | OR |
| USWPA | Warren | PA |
| USWAJ | Warren | RI |