Average GPS coordinates for Trevallyn Postcode location: -32.543, 151.537. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Trevallyn on map:

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Listing cities & postcodes (1):
>> New South Wales, 2421 Trevallyn, HUNTER, GPS coordinates: -32.5432,151.5372