Prior to the 1918 boundary reforms, the county of Aberdeen had been covered, nominally, by the four constituencies of East Aberdeenshire, West Aberdeenshire, Aberdeen North, and Aberdeen South, and the county of Kincardine had been covered, nominally, by the Kincardineshire constituency. This arrangement dated from 1885, however, and predated both the redefinition of counties as local government areas, under the Local Government (Scotland) Act 1889, and the creation of the city of Aberdeen in 1900. 1918 constituency boundaries took account of new local government boundaries.
New constituency boundaries were drawn for the 1950 general election. Aberdeen and Kincardine Central was abolished and its area was divided between the new constituency of North Angus and Mearns and a new West Aberdeenshire. North Angus and Mearns was created to cover the county of Kincardine and part of the county of Angus. The new West Aberdeenshire was entirely within the county of Aberdeen, but boundaries differed from those of the earlier constituency of that name. The county of Aberdeen was then otherwise covered by East Aberdeenshire, and the city of Aberdeen was again covered by Aberdeen North and Aberdeen South.
Another General Election was required to take place before the end of 1940. The political parties had been making preparations for an election to take place and by the Autumn of 1939, the following candidates had been selected;