Based on the Australian National Placename Survey (ANPS)
Bulk search for placenames from a .txt or .csv file. The placenames may be comma separated on a single line or one per line:
Search for places within a polygon in a KML file. (Polygons may be exported from other systems as a KML file.) NB: this has a known bug to be fixed in the next update - it may work if coordinates of the polygon are each on a new line.