The parish includes part of the forest of Burnham Beeches, and had a population of 2,458 at the 2021 census.

The parish of Wexham originally covered a relatively small 748 acres (3.0 km2) (1.2 square miles) according to the 1881 and 1891 censuses.

It was almost doubled in 1934 by taking in 1,823 acres (7.38 km2) and about 1,000 people from the dissolved Langley Marish parish, a very long strip parish part of which was taken in by Gerrards Cross almost four miles to the north.

It and some additional unparished territory formed the current (adjustable) three-member Slough Borough Council ward of Wexham Lea.

The parish relies for its education on neighbouring villages with greater populations, save that the Japanese international boarding school Teikyo School United Kingdom is in Wexham.