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Parishes
| Parish Name | Type of Parish | Duration | Notes
| | Allt Mawr | Parish (ancient), Civil parish | 1894-1974 |
| | Builth | Parish (ancient), Civil parish | 1894-1974 |
| | Crucadarn | Parish (ancient), Civil parish | 1894-1974 |
| | Gwarafog | Hamlet, Civil parish | 1894-1974 |
| | Gwenddwr | Parish (ancient), Civil parish | 1894-1974 |
| | Llanafan Fawr | Parish (ancient), Civil parish | 1894-1974 |
| | Llanafan Fechan | Parish (ancient), Civil parish | 1894-1974 |
| | Llanddewi Abergwesyn | Parish (ancient), Civil parish | 1894-1974 |
| | Llanddewir Cwm | Parish (ancient), Civil parish | 1894-1974 |
| | Llanddulas | Parish (ancient), Civil parish | 1894-1974 |
| | Llanfihangel Abergwesyn | Parish (ancient), Civil parish | 1894-1974 |
| | Llanfihangel Brynpabuan | Parish (ancient), Civil parish | 1894-1974 |
| | Llanganten | Parish (ancient), Civil parish | 1894-1974 |
| | Llangynog | Parish (ancient), Civil parish | 1894-1974 |
| | Llanllywenfel | Parish (ancient), Civil parish | 1894-1974 |
| | Llanwrthwl | Parish (ancient), Civil parish | 1834-1974 | from Civil Parish of Llanwrthwl Rural District in 1934
| | Llanwrtyd Without | Civil parish | 1894-1974 |
| | Llanynys | Parish (ancient), Civil parish | 1894-1974 |
| | Llysdinam | Township, Civil parish | 1894-1974 |
| | Maesmynys | Parish (ancient), Civil parish | 1894-1974 |
| | Penbuallt | Township, Civil parish | 1894-1974 |
| | Rhosferig | Hamlet, Civil parish | 1894-1974 |
| | Treflys | Township, Civil parish | 1894-1974 |
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