| Country | France (FR) |
| UN/LOCODE | C3S |
| Name | Saint-Cyr-sous-Dourdan |
| Name Without Diacritics | Saint-Cyr-sous-Dourdan |
| Region | 91 |
| Function Code | -----6-- |
| Function | Multi-use Location |
| Status Code | RL (Recognised Location) |
| Date | 1901 |
| Timezone | Europe/Paris |
| Location (UN Format) | 4834N 00202E |
| Latitude Longitude | 48.5667, 2.0333 |