As a result of the local government reorganisation introduced by the Local Government Act 1972, which came into effect on 1 April 1974, the boundaries of the historic/administrative county were altered, with southernmost parts, including the Borough of Slough, being transferred to the county of Berkshire.
The table below shows the number of MPs representing Buckinghamshire at each major redistribution of seats affecting the county.
County seat Borough seat 1Borough was formally known as Chipping Wycombe The county also included six Parliamentary Boroughs, namely Amersham, Aylesbury, Buckingham, Chipping Wycombe, Great Marlow and Wendover, all returning 2 MPs (burgesses) continuously since at least 1624.
The new constituency comprised the Borough of Milton Keynes, with the exception of Stony Stratford and Wolverton, which were retained in Buckingham.
In addition, Marlow was transferred from Wycombe to Beaconsfield and Princes Risborough from Aylesbury to Buckingham.