The Welsh town of Treharris is mostly within the county of Mid Glamorgan and has a population of approximately 6,100.
Most of Treharris is governed by Merthyr Tudful - Merthyr Tydfil council with the remainder being in the area of Caerffili - Caerphilly council
Most of Treharris is policed by South Wales Police with the remainder being policed by Gwent Police
The largest Parliamentary Constituency in Treharris is Merthyr Tydfil and Rhymney (94.74%) with the remainder being in Caerphilly (5.26%)
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