| Code | Name | Region |
|---|---|---|
| USZAO | Taintor | IA |
| USZIV | Takoma Park | MD |
| USTCT | Takotna | AK |
| USTKL | Taku Lodge | AK |
| USTNT | Talbott | TN |
| USTC7 | Talco | TX |
| USYTL | Talent | OR |
| USTA2 | Talihina | OK |
| USTKA | Talkeetna | AK |
| USTBB | Talla Bena | LA |
| USYL9 | Sylvania | OH |
| USSYV | Sylvester | GA |
| USYMO | Symsonia | KY |
| USSYQ | Syosset | NY |
| USSYZ | Syracuse | IN |
| USYRA | Syracuse | NE |
| USSYR | Syracuse | NY |
| USYCS | Syracuse | OH |
| USJAU | Syracuse | UT |
| USTAB | Tabb | VA |
| USTBQ | Tabernacle | NJ |
| USTA4 | Tabernash | CO |
| USXNC | Tabor | IA |
| USTB3 | Tabor | SD |
| USQTB | Tabor City | NC |
| USTIW | Tacoma | WA |
| USTCH | Taconite Harbor | MN |
| USTF2 | Taft | CA |
| USTFT | Taft | LA |
| US8AF | Taft | TX |
| USIWT | Swiftwater | PA |
| USJWI | Swisher | IA |
| USSWI | Swissvale | PA |
| USS4W | Switz City | IN |
| USZSW | Switzer | WV |
| USZS2 | Swoope | VA |
| USDSK | Swords Creek | VA |
| USS3Y | Sycamore | AL |
| USYYC | Sycamore | GA |
| USSYC | Sycamore | IL |
| USZIS | Sycamore | OH |
| USYDY | Sydney | ND |
| USZJF | Sykesville | MD |
| USS6K | Sykesville | PA |
| USSYU | Sylacauga | AL |
| USSYY | Sylmar | CA |
| USSL6 | Sylva | NC |
| USYNL | Sylvan Lake | MI |
| USYNX | Sylvania | AL |
| USXMZ | Sylvania | GA |