This is a list of postcodes in the LL20 9 area covering the areas of Froncysyllte, Garth, Glyn Ceiriog, Llanarmon Dyffryn Ceiriog, Llwynmawr, Pandy, Pontcysyllte, Pontfadog, Rhewl, Tregeiriog, Trevor, Llangollen, Eglwyseg, Llantysilio, Denbighshire.
 Active postcode
Active postcode 
   Postcode no longer in use
Postcode no longer in use| Postcode | Latitude | Longitude | Easting | Northing | Grid reference | Active? | 
|---|---|---|---|---|---|---|
| LL20 9AA | 0 | 0 | No | |||
| LL20 9AB | 0 | 0 | No | |||
| LL20 9AD | 0 | 0 | No | |||
| LL20 9AE | 0 | 0 | No | |||
| LL20 9AF | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AG | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AH | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AJ | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AL | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AN | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AP | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AQ | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AR | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AS | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AT | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AU | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AW | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AX | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9AY | 52.969397 | -3.170235 | 321506 | 341979 | SJ215419 | No | 
| LL20 9BA | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9BB | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | No | 
| LL20 9BE | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | No | 
| LL20 9BF | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9BG | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9BH | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | No | 
| LL20 9BJ | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | No | 
| LL20 9BL | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | No | 
| LL20 9BP | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9BQ | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9BR | 52.968945 | -3.172307 | 321366 | 341931 | SJ213419 | Yes | 
| LL20 9ZZ | 0 | 0 | No |