| Code | Name | Region |
|---|---|---|
| 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 |
| USVRZ | Warren | VT |
| USW6B | Warren Center | PA |
| USWRR | Warrendale | PA |
| USWR9 | Warrens | WI |
| USJCQ | Warrensburg | IL |
| USSZL | Warrensburg | MO |
| USWR8 | Warrensburg | NY |
| USWHH | Warrensville Heights | OH |
| USWRE | Warrenton | GA |
| USWRT | Warrenton | MO |
| USWFT | Warrenton | NC |
| USWUO | Warrenton | OH |
| USWMV | Wareham | MA |
| USWPC | Warehouse Point | CT |
| USYWF | Warfordsburg | PA |
| US3AR | Warm Springs | AR |
| USWJY | Warm Springs | CA |
| USRMR | Warm Springs | OR |
| US9WS | Warm Springs | VA |
| USWRM | Warminster | PA |