It is located about 35 kilometres (22 mi) north-east of the town of Hobart.

[2] The 2021 census determined a population of 799 for the locality of Lewisham.

[3] The locality is named for the family of Arndell Lewis, an Australian politician.

The shore of Pitt Water forms the western and south-western boundaries.

[4] The C340 route (Lewisham Scenic Drive) runs south from the Arthur Highway through the locality, providing access to other localities.