| Code | Name | Region |
|---|---|---|
| USZOS | Stockton | NJ |
| US7SS | Stockton Springs | ME |
| US8SO | Stoddard | NH |
| USTDU | Stoddard | WI |
| USKVE | Stokesdale | NC |
| USSTO | Stone | SC |
| USSUM | Stone Mountain | GA |
| USOEK | Stone Park | IL |
| USYYR | Stone Ridge, Ulster | NY |
| USTOF | Stoneboro | PA |
| USSTU | Stoneham | MA |
| US8AM | Stoneham | ME |
| USSHT | Stonehurst | CA |
| USSTV | Stoneville | MS |
| USSVX | Stoneville | NC |
| USLA9 | Stonewall | LA |
| USSWL | Stonewall | MS |
| USS9E | Stonewall | TX |
| USXVS | Stonewood | WV |
| USSWO | Stillwater | OK |
| USTLZ | Stilwell | KS |
| USQSL | Stilwell | OK |
| US3SB | Stinson Beach | CA |
| USTRG | Stirling | NJ |
| USS4T | Stittville | NY |
| USSKB | Stockbridge | GA |
| USTCB | Stockbridge | MA |
| USSKG | Stockbridge | MI |
| USKGB | Stockbridge | VT |
| USSD4 | Stockdale | TX |
| USSTT | Stockertown | PA |
| USTK9 | Stockett | MT |
| US9HO | Stockholm | ME |
| USTZK | Stockton | AL |
| USSCK | Stockton | CA |
| US9SK | Stockton | GA |
| US87O | Stockton | IA |
| USTC8 | Stockton | IL |
| USS3T | Stockton | KS |
| USZSB | Stevensburg | VA |
| USSJZ | Stevenson | AL |
| USEVS | Stevenson | WA |
| USS3H | Stevenson Ranch | CA |
| USSVV | Stevensville | MD |
| USSLW | Stevensville | MI |
| USTES | Stevensville | MT |
| USF8S | Stevinson | CA |
| USTER | Stewart | AL |
| USTWT | Stewart | AL |
| USTWM | Stewart, Mcleod | MN |