The town lies on the west bank of the waterway called Sussex Inlet, which divides New South Wales from the Jervis Bay Territory.

[2][3] As at the 2021 census, the population of the Sussex Inlet-Berrara area was 4,694.

[4] The town of Sussex Inlet is located on the west bank of Sussex Inlet, a narrow inlet connecting Wreck Bay to the waterbody of St Georges Basin.

The east bank of Sussex Inlet is the Booderee National Park.

Jervis Bay Airport is located about 10 kilometres (6.2 mi) east of Sussex Inlet.