The Welsh village of Trecastle is mostly within the county of Powys and has a population of approximately 1,000.
Most of Trecastle is governed by Powys - Powys council with the remainder being in the area of Sir Gaerfyrddin - Carmarthenshire council
Trecastle is policed by Dyfed-Powys Police
The largest Parliamentary Constituency in Trecastle is Brecon and Radnorshire (75.00%) with the remainder being in Carmarthen East and Dinefwr (25.00%)
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