How many places in Australia are called Grindstone Island?

There is one place named Grindstone Island in Australia.

All places in the world called "Grindstone Island".

Location Grindstone Island:

• South Australia

Cities

Gladstone (5)
Hamilton (5)
Kingston (5)
Gordon (4)
Windsor (4)
Newstead (4)
Cremorne (4)
Springfield (4)
Woodstock (4)
Darlington (4)
Rosedale (4)
Richmond (4)
Mosquito Creek (3)
Spring Hill (3)
Brighton (3)
Buxton (3)
Clare (3)
Homebush (3)
Stratford (3)
Bald Hills (3)
Inglewood (3)
Greenmount (3)
Laura (3)
Lyndhurst (3)
Mount Pleasant (3)
Oakwood (3)
Seymour (3)
Stonehenge (3)
Windermere (3)
Alberton (3)