| Code | Name | Region |
|---|---|---|
| USUUI | Utica | NE |
| USUCA | Utica | NY |
| USUTI | Utica | OH |
| USUC8 | Utica | SD |
| USUTO | Utopia Creek | AK |
| USUVD | Uvalda | GA |
| USUVA | Uvalde | TX |
| USUWC | Uwchland | PA |
| USUXX | Uxbridge | MA |
| USKUY | Uyak | AK |
| USVCX | Vacaville | CA |
| US9UC | Upper Chichester | PA |
| USUDY | Upper Darby | PA |
| USUPF | Upper Freehold | NJ |
| USUPJ | Upper Jay | NY |
| USMB9 | Upper Malboro | MD |
| USUPM | Upper Marlboro | MD |
| USUPS | Upper Saddle River | NJ |
| USQUS | Upper Saint Regis | NY |
| USUPE | Upper Sandusky | OH |
| USUP8 | Upperco | MD |
| USUPV | Upperville | VA |
| USUPT | Upton | MA |
| USXUP | Upton | NY |
| USUWY | Upton | WY |
| USURN | Urania | LA |
| USURC | Urbana | IA |
| USURB | Urbana | IL |
| USIUA | Urbana | IN |
| USURO | Urbana | OH |
| USUCR | Urbancrest | OH |
| USUV9 | Unionville | PA |
| USBU8 | Unionville | TN |
| USUZP | Uniopolis | OH |
| USUHI | Unity | ME |
| USUWI | Unity | WI |
| USUVC | Universal City | CA |
| USKVY | Universal City | TX |
| USM6S | University | MO |
| USUVX | University City | MO |
| USUH3 | University Heights | OH |
| USUP2 | University Park | FL |
| USUPK | University Park | IL |
| USUK7 | University Park | PA |
| USUKK | University Park | TX |
| USUUP | University Place | WA |
| USCCB | Upland | CA |
| USUPL | Upland | IN |
| USUPP | Upolu Point | HI |
| USUPQ | Upper Arlington | OH |