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.
General Election 1939–40:
Another General Election was due to take place before the end of 1940. From 1939, the parties had been making preparations for an election, and by the end of that year, the following candidates had been selected:
^Kimber, Richard. "UK General Election results 1931". Political Science Resources. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1935". Political Science Resources. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1945". Political Science Resources. Archived from the original on 4 March 2016. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1950". Political Science Resources. Archived from the original on 1 May 2016. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1951". Political Science Resources. Archived from the original on 29 June 2017. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1955". Political Science Resources. Archived from the original on 11 August 2011. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1959". Political Science Resources. Archived from the original on 11 August 2011. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1964". Political Science Resources. Archived from the original on 29 June 2017. Retrieved 14 April 2016.
^Kimber, Richard. "UK General Election results 1966". Political Science Resources. Archived from the original on 11 August 2011. Retrieved 14 April 2016.
^"UK General Election results 1970". Politics Resources. Archived from the original on 11 August 2011. Retrieved 21 March 2016.
^"UK General Election results February 1974". Politics Resources. Archived from the original on 11 August 2011. Retrieved 21 March 2016.
^ abc"'Denbigh', Feb 1974 - May 1983". ElectionWeb Project. Cognitive Computing Limited. Archived from the original on 1 April 2016. Retrieved 21 March 2016.
^"UK General Election results February 1974". Politics Resources. Archived from the original on 11 August 2011. Retrieved 21 March 2016.
^"UK General Election results 1979". Politics Resources. Archived from the original on 11 August 2011. Retrieved 21 March 2016.
Boundaries of Parliamentary Constituencies 1885-1972, compiled and edited by F.W.S. Craig (Parliamentary Reference Publications 1972)
British Parliamentary Election Results 1918-1949, compiled and edited by F.W.S. Craig (Macmillan Press, revised edition 1977)
British Parliamentary Election Results 1950-1973, compiled and edited by F.W.S. Craig (Parliamentary Research Services 1983)
British Parliamentary Election Results 1974-1983, compiled and edited by F.W.S. Craig (Parliamentary Research Services 1984)
Leigh Rayment's Historical List of MPs – Constituencies beginning with "D" (part 1)