| Country | United Kingdom (GB) |
| UN/LOCODE | YST |
| Name | Ystradgynlais |
| Name Without Diacritics | Ystradgynlais |
| Region | POW |
| Function Code | -23----- |
| Function | Rail, Road |
| Status Code | RL (Recognised Location) |
| Date | 401 |
| Timezone | Europe/London |
| Location (UN Format) | 5146N 00346W |
| Latitude Longitude | 51.7667, -3.7667 |