Average GPS coordinates for Castlereagh Postcode location: -33.69, 150.679. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Castlereagh on map:

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Listing cities & postcodes (1):
>> New South Wales, 2749 Castlereagh, PENRITH, GPS coordinates: -33.6898,150.6789