The table below shows the number of MPs representing Bedfordshire at each major redistribution of seats affecting the county.
County seat Borough seat South Bedfordshire Biggleswade covered the northern half of the county including Biggleswade, Ampthill and Kempston as well as non-resident freeholders of the Municipal Borough of Bedford.
The southern areas of Biggleswade, including the urban districts of Biggleswade and Ampthill were included in a new Mid Bedfordshire Division, along with Leighton Buzzard and surrounding rural areas transferred from Luton.
Mid Bedfordshire gained some southern and eastern rural areas of Bedford.
To compensate for this and the loss of Kempston, Mid Bedfordshire regained the areas previously transferred to South West Bedfordshire and gained the parts outside the Borough of Luton from Luton North (including Flitwick).