| Code | Name | Region |
|---|---|---|
| USW5D | Waumandee | WI |
| USWAU | Wauna | OR |
| USYWN | Wauna | WA |
| USWP6 | Waterport | NY |
| USWPF | Waterproof | LA |
| USWTT | Watertown | CT |
| USWTW | Watertown | MA |
| USART | Watertown | NY |
| USATY | Watertown | SD |
| USWWZ | Watertown | TN |
| USWAF | Watertown | WI |
| USVWL | Waterville | KS |
| USWVS | Waterville | MA |
| USWVL | Waterville | ME |
| USW23 | Waterville | NY |
| USTEI | Waterville | OH |
| US999 | Waterville | PA |
| USTIL | Waterville | WA |
| USWZY | Waterville Valley | NH |
| USWTV | Watervliet | MI |
| USXOE | Watervliet | NY |
| USWF3 | Watford City | ND |
| USWJA | Wathena | KS |
| USWVD | Waterford | CA |
| USTQF | Waterford | CT |
| USWTM | Waterford | ME |
| USWTF | Waterford | MI |
| USUZK | Waterford | NY |
| USXWF | Waterford | OH |
| USWXX | Waterford | PA |
| USWF8 | Waterford | VT |
| USTEY | Waterford | WI |
| USWFJ | Waterford Works | NJ |
| USVTL | Waterloo | AL |
| USALO | Waterloo | IA |
| USZTE | Waterloo | IL |
| USZZE | Waterloo | IN |
| USXWA | Waterloo | NE |
| USWOO | Waterloo | NY |
| USW2O | Waterloo | OH |
| USZWA | Waterloo | WI |
| USWPV | Waterloo, Johnson | IN |
| USWTA | Waterman | IL |
| USWGK | Washington Park | IL |
| USW9A | Washington Terrace | UT |
| USY7T | Washington Township | NJ |
| USGIP | Washington Township | NJ |
| USWSL | Washingtonville | NY |
| USWG8 | Washingtonville | PA |
| USWXG | Washougal | WA |