St Marys Community

The suburb of St Marys has an approximate area of 11 km².

It is surrounded by the suburbs of Claremont Meadows, Colyton, Llandilo, North St Marys, Orchard Hills, Oxley Park, Ropes Crossing, Shanes Park, St Clair, Tregear, Werrington and Werrington County.

It is comprised of parts of the councils of Blacktown and Penrith.

It is within the state electorate of Londonderry.

It is comprised of parts of the federal electorates of Chifley and Lindsay.