The English village of Castleside is mostly within the county of Durham and has a population of approximately 1,900.
Most of Castleside is governed by County Durham council with the remainder being in the area of Northumberland council
Most of Castleside is policed by Durham Police with the remainder being policed by Northumbria Police
The largest Parliamentary Constituency in Castleside is North West Durham (85.71%) with the remainder being in Hexham (14.29%)
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