| Code | Name | Region |
|---|---|---|
| CHSTG | Steg | ZH |
| CHSTN | Stein | AG |
| CHTGS | Stein Am Rhein | TG |
| CHSTE | Steinach | SG |
| CHSTB | Steinebrunn | TG |
| CHSNE | Steinen | SZ |
| CHSTI | Steinhausen | ZG |
| CHSMR | Steinmaur | ZH |
| CHZSG | Sternenberg | ZH |
| CHSTT | Stetten | AG |
| CHSTF | Stettfurt | TG |
| CHSTL | Stettlen | BE |
| CHSTO | Stoos | SZ |
| CHSGB | Strengelbach | AG |
| CHSTU | Studen | BE |
| CHSIS | Sisseln | AG |
| CHSSS | Sisseln Ag | BL |
| CHSID | Sitterdorf | TG |
| CHFSZ | Siviriez | FR |
| CHSOO | Solothurn | SO |
| CHSOM | Someo | TI |
| CHSMM | Sommeri | TG |
| CHSZS | Sonceboz-sombeval | BE |
| CHSOR | Sorens | FR |
| CHSOY | Soyhieres | JU |
| CHSCR | Speicher | AR |
| CHSPZ | Spiez | BE |
| CHSPB | Spreitenbach | AG |
| CHNLS | St Niklausen | OW |
| CHANT | St. Antoni | FR |
| CHURS | St. Ursen | FR |
| CHSBO | Stabio | TI |
| CHSDL | Stadel | ZH |
| CHSFA | Stafa | ZH |
| CHOBW | Stalden | OW |
| CHZSF | Sennhof | ZH |
| CHSND | Sennwald | SG |
| CHSNT | Sent | GR |
| CHSEO | Seon | AG |
| CHSUZ | Seuzach | ZH |
| CHSVZ | Sevaz | FR |
| CHSVN | Sevelen | SG |
| CHSBN | Siebnen | SZ |
| CHSIE | Siegershausen | TG |
| CHSRR | Sierre | VS |
| CHSGO | Sigirino | TI |
| CHFGT | Siglistorf | AG |
| CHSIY | Signy-avenex | VD |
| CHSRU | Sihlbrugg | ZG |
| CHSHG | Sihlbrugg Dorf | ZG |