| Code | Name | Region |
|---|---|---|
| USWWA | Wasilla | AK |
| USZJN | Waskom | TX |
| USWA5 | Wassaic | NY |
| US4AG | Wataga | IL |
| USWA6 | Watchung | NJ |
| USAEM | Water Mill | NY |
| USWVA | Water Valley | MS |
| USWB9 | Waterboro | ME |
| USWAT | Waterbury | CT |
| USWBV | Waterbury | VT |
| USKWF | Waterfall | AK |
| USTFW | Waterflow | NM |
| USWGI | Washington | IL |
| USWSQ | Washington | IN |
| USWS9 | Washington | KS |
| USHQJ | Washington | LA |
| USLXZ | Washington | LA |
| US8NG | Washington | ME |
| USNGN | Washington | MI |
| USWSK | Washington | MO |
| USOCW | Washington | NC |
| US8WS | Washington | NH |
| USWQY | Washington | NJ |
| USWSG | Washington | PA |
| USWGT | Washington | UT |
| USW88 | Washington | VA |
| USH6T | Washington | VT |
| USWWV | Washington | WV |
| USWC9 | Washington County | ME |
| USWCQ | Washington Court House | OH |
| 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 |