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Penllyn Rural District was a large inland district in the centre of Merionethshire, Wales and existed from 1894 until 1974 when Merionethshire was abolished. Its parishes surrounded the urban district of Bala.
Parishes
| Parish Name | Type of Parish | Duration | Notes
| | Llandderfel | Parish (ancient), Civil parish | 1894-1974 |
| | Llanfor | Parish (ancient), Civil parish | 1894-1974 |
| | Llangywer | Parish (ancient), Civil parish | 1894-1974 |
| | Llanuwchllyn | Parish (ancient), Civil parish | 1894-1974 |
| | Llanycil | Parish (ancient), Civil parish | 1894-1974 |
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