| Code | Name | Region |
|---|---|---|
| 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 |
| USUWA | Ware | MA |
| USASS | Ware Shoals | SC |
| USRBW | Walterboro | SC |
| USRRR | Walters | OK |
| US2WL | Walterville | OR |
| USWLM | Waltham | MA |
| USWXA | Walthourville | GA |
| USWL6 | Walton | IN |
| USWKU | Walton | KS |
| USQWT | Walton | KY |
| USW7L | Walton | NE |
| USJWO | Walton | NY |
| USWJP | Walton Hills | OH |
| USWAW | Walworth | WI |
| USWAO | Wamego | KS |
| USWP3 | Wampsville | NY |
| USWMM | Wampum | PA |
| USWU3 | Wamsutter | WY |
| USWAN | Wanamingo | MN |
| USIWQ | Wanaque | NJ |