| Code | Name | Region |
|---|---|---|
| USSZY | Staley | NC |
| USTAI | Stallings | NC |
| USXLX | Stamford | CT |
| USSDJ | Stamford | NY |
| USSTF | Stamford | TX |
| US7SF | Stamford | VT |
| US9SG | Stamping Ground | KY |
| USSTM | Stamps | AR |
| USTNB | Stanberry | MO |
| USSGP | Springlake | TX |
| USSP7 | Springport, Jackson | MI |
| USSP8 | Springtown | TX |
| USSG9 | Springvale | ME |
| USSW9 | Springview | NE |
| USSPL | Springville | AL |
| USSG8 | Springville | CA |
| USSG5 | Springville | IA |
| USIGL | Springville | NY |
| USXMN | Springville | TN |
| USSNU | Springville | UT |
| USXPG | Springville, Suffolk | NY |
| USYSP | Sproul | PA |
| USUHD | Spruce Head | ME |
| USS4P | Spruce Pine | AL |
| USSPU | Spruce Pine | NC |
| USSU5 | Spur | TX |
| USUEC | Spurger | TX |
| USSQT | Squaw Valley | CA |
| USS2M | St. Maries | ID |
| USSFY | Springfield | MA |
| USSFK | Springfield | MD |
| USIID | Springfield | ME |
| USSNF | Springfield | MN |
| USSGF | Springfield | MO |
| USS8P | Springfield | NE |
| USIED | Springfield | NH |
| USSFI | Springfield | NJ |
| USSGH | Springfield | OH |
| USSPY | Springfield | OR |
| USNGF | Springfield | PA |
| USIEZ | Springfield | SC |
| USIGI | Springfield | SD |
| USSRG | Springfield | TN |
| USSPG | Springfield | VA |
| USVSF | Springfield | VT |
| USSFG | Springfield Gardens | NY |
| USVSJ | Springfield, Calhoun | MI |
| USSIQ | Springhill | LA |
| USRGK | Springhills | OH |
| USZPL | Spring Lake | MI |