The constituency comprised the Urban District of Beaconsfield and parts of the Rural District of Amersham, transferred from the Aylesbury constituency, and the Rural District of Eton, transferred from Eton & Slough.
The constituency was abolished for the February 1974 general election, when major boundary changes split the area between the new constituencies of Beaconsfield and Chesham & Amersham. The parts of the Rural District of Amersham were included in Chesham and Amersham. Beaconsfield and the Rural District of Eton formed the bulk of the Beaconsfield constituency.
The Urban District of Beaconsfield, the Rural District of Eton, and in the Rural District of Amersham the parishes of Amersham, Chalfont St Giles, Chalfont St Peter, Chenies, Chesham Bois, Coleshill, Penn, and Seer Green.