The Welsh town of Ystradgynlais is mostly within the county of Powys and has a population of approximately 4,700.
Most of Ystradgynlais is governed by Powys - Powys council with the remainder being in the area of Castell-nedd Port Talbot - Neath Port Talbot council
Most of Ystradgynlais is policed by Dyfed-Powys Police with the remainder being policed by South Wales Police
The largest Parliamentary Constituency in Ystradgynlais is Brecon and Radnorshire (94.44%) with the remainder being in Neath (5.56%)
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