| Code | Name | Region |
|---|---|---|
| ROSTM | Stamora Germana | |
| ROSTI | Stefanesti, Arges | |
| ROSTJ | Stefanestii De Jos | B |
| ROTEI | Stei | BH |
| ROST9 | Stejaru | TL |
| ROSBC | Subcetate | HR |
| ROSCV | Suceava | |
| ROSUN | Suceava Nord | |
| ROSUL | Sulina (port Et Zone Franche) | TL |
| ROSCS | Suncuius | |
| ROSUR | Sura Mica | SB |
| ROTAL | Talea | PH |
| ROTAM | Tamna | |
| ROBNS | Tancabesti | IF |
| ROSDR | Sindrilita | B |
| ROSGM | Singeorgiu De Mures | MS |
| ROSMR | Sinmartin | CJ |
| ROSIN | Sinnicolau Mare | TM |
| RO4SB | Sinpetru | BV |
| ROSMU | Sintana De Mures | MS |
| ROSTG | Sintereag | BN |
| ROSRU | Sintimbru | AB |
| ROSIR | Siret | SV |
| ROSLA | Slatina | OT |
| ROSTR | Slatioara | OT |
| ROSCZ | Slava Cercheza | CT |
| ROSRS | Slava Rusa | TL |
| ROSBA | Slobozia | IL |
| ROSLS | Slobozia Sucevei | SV |
| ROSLO | Slobozia, Arges | AG |
| ROSDN | Smardan | |
| ROSGV | Snagov | |
| ROSOC | Socetu | |
| ROSOL | Socola | |
| ROSAV | Saveni | BT |
| ROVST | Savinesti | NT |
| ROSCH | Scheia | SV |
| ROSCO | Scornicesti | OT |
| ROSBS | Sebes, Alba | AB |
| ROSEC | Secueni | NT |
| RODOJ | Segarcea | DJ |
| ROSNI | Seini | MM |
| ROSEI | Seitin | AR |
| ROSEL | Selimbar | SB |
| ROSFG | Sfantul-gheorghe | CV |
| ROSBZ | Sibiu | |
| ROSIM | Sighetu Marmatiei | |
| ROSSA | Sighisoara | MS |
| ROSIT | Simeria | HD |
| ROSMN | Simian | BH |