| Cwm Penmachno | |
|---|---|
 Houses in Cwm Penmachno, showing the quarry behind | |
  Cwm Penmachno Location within Conwy | |
| OS grid reference | SH750472 |
| Community | |
| Principal area | |
| Country | Wales |
| Sovereign state | United Kingdom |
| Post town | BETWS-Y-COED |
| Postcode district | LL24 |
| Dialling code | 01690 |
| Police | North Wales |
| Fire | North Wales |
| Ambulance | Welsh |
| UK Parliament | |
| Senedd Cymru – Welsh Parliament | |
Cwm Penmachno (historically called Tre-Gynwal[1]) is a village at the head of Cwm Machno in North Wales.
- ^ Caernarvonshire XXIX.NE (Map). Ordnance Survey. 1912.