The Welsh village of Cwm-twrch Isaf is mostly within the county of Powys and has a population of approximately 800.
Most of Cwm-twrch Isaf is governed by Powys - Powys council with the remainder being in the area of Castell-nedd Port Talbot - Neath Port Talbot council
Most of Cwm-twrch Isaf is policed by Dyfed-Powys Police with the remainder being policed by South Wales Police
The largest Parliamentary Constituency in Cwm-twrch Isaf is Brecon and Radnorshire (66.67%) with the remainder being in Neath (33.33%)
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