The constituency straddled the authorities of
Denbighshire and the borough of
Wrexham. Main population centres included the suburbs of
Ruabon,
Chirk,
Rhosllannerchrugog,
Cefn Mawr and
Coedpoeth to the south of the city of
Wrexham, in addition to
Llangollen and
Corwen further up the
Dee valley to the west. Until the 2010 election, the constituency included a small part of the preserved county of
Powys. This anomaly was resolved by the
Boundary Commission for Wales with the boundaries first used in
2010. The constituency comprised the following electoral wards: • From Wrexham: Overton, Bronington, Dyffryn Ceiriog/Ceiriog Valley, Chirk North, Gwenfro, Johnstown, Llangollen Rural, Marchwiel, Penycae, Penycae and Ruabon South, Plas Madoc, Ponciau, Ruabon, Bryn Cefn, Minera, Brymbo, Coedpoeth, Cefn, Chirk South, Esclusham, New Broughton, Pant • From Denbighshire: Corwen, Llangollen, Llandrillo ==Members of Parliament==