| Code | Name | Region |
|---|---|---|
| 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 |
| USWAR | Warne | NC |
| USJRN | Warner | NH |
| USWRB | Warner Robins | GA |
| USWS3 | Warner Springs | CA |
| USWRS | Warners | NY |
| USWQR | Warren | AR |
| USWR5 | Warren | CT |
| USWEN | Warren | IL |
| USZWR | Warren | IN |
| USWXN | Warren | MA |
| USW3R | Warren | ME |
| USWAM | Warren | MI |
| USWFH | Wando | SC |
| US9WT | Wanette | OK |
| USWG5 | Wantage | NJ |
| USTWH | Wantagh | NY |
| USAXV | Wapakoneta | OH |
| USWPW | Wapato | WA |
| US5WP | Wapello | IA |
| USIIH | Wapiti | WY |
| USWFS | Wappingers Falls | NY |
| USJWW | Wapwallopen | PA |
| USWD7 | Ward | AR |
| USD5R | Ward | CO |
| USYWD | Ward | SC |
| USWDC | Ward Cove | AK |
| USWHZ | Ward Hill | MA |
| USWEW | Warden | WA |
| USWAE | Wardensville | WV |
| US7WA | Wardsboro | VT |