The civil parish of Mapledurham covers a considerably larger area than the village itself, and includes the even smaller settlements of Trench Green and Chazey Heath in the Chiltern Hills above the village. It is bordered to the west by the parishes of Whitchurch-on-Thames and Goring Heath, to the north by the parish of Kidmore End, to the east by the Reading suburb of Caversham, and to the south by the River Thames. In the 2011 census, Mapledurham civil parish had a population of 317, an increase of 37 over the previous census in 2001.