| Code | Name | Region |
|---|---|---|
| USWML | Westmoreland | PA |
| USW2M | Westmoreland | TN |
| USWY9 | Westmoreland City | PA |
| USWST | Westerly | RI |
| USVGN | Western Grove | AR |
| US3WS | Western Springs | IL |
| USWPZ | Westernport | MD |
| USWN8 | Westernville | NY |
| USWTY | Westerville | OH |
| USWFI | Westfield | IN |
| USBAF | Westfield | MA |
| US9FI | Westfield | ME |
| USWFL | Westfield | NC |
| USWFU | Westfield | NJ |
| USWXY | Westfield | NY |
| USW7E | Westfield | VT |
| USWF2 | Westfield | WI |
| USWFR | Westford | MA |
| USFHW | Westford | VT |
| USQWH | Westhampton | NJ |
| USFOK | Westhampton | NY |
| USUWB | Westhampton Beach | NY |
| USWHP | Westhope | ND |
| USESI | West Windsor | VT |
| USEFU | West Winfield | NJ |
| USTDZ | West Winfield | NY |
| USWMU | West Yarmouth | MA |
| USWYS | West Yellowstone | MT |
| USWYK | West York | PA |
| USWEP | Westampton | NJ |
| USWQB | Westboro | WI |
| USWRO | Westborough | MA |
| USWZK | Westbrook | CT |
| USWTB | Westbrook | ME |
| USWBY | Westbury | NY |
| USVSY | Westby | WI |
| USWQH | Westchester | CA |
| USES3 | Westchester | IL |
| USXNP | Westchester | MA |
| USWC6 | Westchester | OH |
| USHPN | Westchester County Apt | NY |
| USWFF | Westcliffe | CO |
| USWE2 | Westerlo | NY |
| USWSX | West Sound | WA |
| USWSU | West Springfield | IL |
| USWSP | West Springfield | MA |
| USWPG | West Springfield | NH |
| US9WB | West Stockbridge | MA |
| USNZY | West Swanzey | NH |
| USWZH | West Terre Haute | IN |