| Code | Name | Region |
|---|---|---|
| FISYY | Siipyy (sideby) | 12 |
| FISLY | Siltakyla (broby) | 9 |
| FISOM | Simo | 15 |
| FISIM | Simpele | 2 |
| FISNI | Siuntio | 18 |
| FISIO | Siuro | 11 |
| FISKI | Skinnarvik | 19 |
| FISKB | Skogby | 18 |
| FISKU | Skutviken | |
| FISAK | Sakyla | 17 |
| FISLL | Salla | 10 |
| FISAL | Salo | 19 |
| FISPK | Salpakangas | 18 |
| FISJI | Sammaljoki | 11 |
| FISAN | Sando (santasaari) | 19 |
| FISSI | Sarkisalmi | 2 |
| FISAS | Sastamala | |
| FISAU | Saukkola | 8 |
| FISKL | Saukkola | 18 |
| FIFAA | Sauvo | 19 |
| FISPE | Savitaipale | 2 |
| FISKK | Savukoski | 15 |
| FIKO8 | Saynatsalo | 8 |
| FISJY | Seinajoki | 3 |
| FISTA | Seutula (sjoskog) | 18 |
| FIRIS | Ristiina | 4 |
| FIRSJ | Ristijarvi | 13 |
| FIRTL | Ritola | 3 |
| FIRHU | Rouhu | |
| FIRVN | Rovaniemi | 10 |
| FIRKA | Roykka | 16 |
| FIROY | Roytta | |
| FIRAI | Ruokolahti | 2 |
| FIROO | Ruotila | 9 |
| FIRUO | Ruotsinpyhtaa (stromfors) | 18 |
| FIRUI | Ruovesi | 11 |
| FIRSO | Rusko | 19 |
| FIRUU | Ruukki | 14 |
| FIRYT | Ryttyla | 6 |
| FISKS | Saaksjarvi | 18 |
| FISRV | Saaksjarvi | 11 |
| FISAA | Saaksjarvi | 15 |
| FISAI | Saarijarvi | 3 |
| FISLO | Sailonen | 6 |
| FIRAJ | Rajajooseppi | 10 |
| FIRJM | Rajamaki | 18 |
| FIRNT | Rantasalmi | 13 |
| FIRTY | Rantatoysa | 3 |
| FIRAN | Ranua | 10 |
| FIETA | Raseborg | 18 |