StreetThornleigh StreetSuburbThornleighDetailsThe map of 1884 is the earliest reference to the area being called Thornleigh. It was previously known as South Colah, Pennant Hills or Hornsby.SourceStreet names of Pennant Hills, Patrick, Trevor, Silicon Quill, n. d.Map[1]
Early map of the Parish of Gordon showing Thornleigh.