Mortdale is located 20 kilometres south of the Sydney central business district and is part of the St George area.

[citation needed] The official title for the suburb was set as Mortdale when the railway station opened with that name on 20 March 1897.

[citation needed] An official 1923 inquiry into the proposed Municipality of Mortdale decided against the change, despite the separation movement having the law behind them.

[citation needed] At the same time there was also a push to have the name of Mortdale changed due to its similarity with the suburb of Mortlake and the association with its literal translation from Latin ('Valley of the Dead').

The main shopping centre is located on Morts Road and Pitt Street, near Mortdale railway station.

In 1992, Su Cruickshank, published a book entitled 'Bring A Plate to The Mortdale Scout Hall - The Autobiography of a Fat Tart Complete with Recipes'.

[citation needed] According to the 2021 census, there were 10745 people usually resident in Mortdale, being 49.4% male and 50.6% female, median age 40 years.

Mortdale Heights is located 20 kilometres south of the Sydney central business district in the local government area of the Georges River Council.

This small, elevated area is bounded on the south by Oatley Heights Park and Lime Kiln Bay, and on the west by Hurstville Golf Course.