Average GPS coordinates for St Marys Postcode location: -33.753, 150.906. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). St Marys on map:

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Listing cities & postcodes (2):
>> New South Wales, 1790 St Marys, PENRITH, GPS coordinates: -33.7613,151.0294
>> New South Wales, 2760 St Marys, PENRITH, GPS coordinates: -33.744,150.783