This was a
county division of Denbighshire. In 1918 it comprised the whole of the county, except for the
Municipal Borough of Wrexham and part of the
Chirk Rural District, which formed the Wrexham division. The local authorities in the Denbigh division were the Municipal Boroughs of Denbigh and Ruthin; the
Urban Districts of
Abergele and
Pensarn,
Colwyn Bay and
Colwyn,
Llangollen, and
Llanrwst; and the
Rural Districts of
Llangollen,
Llanrwst,
Llansillin,
Ruthin,
St Asaph (Denbigh), and
Uwchaled, part of Chirk, and the part of
Glan Conway not in
Caernarvonshire. The local authorities in Denbighshire were reorganised in 1935, but that did not affect the boundaries of the parliamentary constituency. In the redistribution which took effect in 1950, the division was redefined as comprising the Municipal Boroughs of Colwyn Bay, Denbigh, and Ruthin; the Urban Districts of Abergele, Llangollen, and Llanrwst; and the Rural Districts of
Aled,
Hiraethog, Ruthin, part of
Ceiriog, and part of
Wrexham. The same local authorities remained within the constituency in the 1974 redistribution. ==Members of Parliament==