Average GPS coordinates for Blackwall Postcode location: -33.5, 151.317. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Blackwall on map:

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Listing cities & postcodes (1):
>> New South Wales, 2256 Blackwall, PYMBLE, GPS coordinates: -33.5,151.3167