Average GPS coordinates for Sefton Postcode location: -33.888, 151.011. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Sefton on map:

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Listing cities & postcodes (1):
>> New South Wales, 2162 Sefton, BANKSTOWN, GPS coordinates: -33.8877,151.0105