Average GPS coordinates for Seaton Postcode location: -34.9, 138.517. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seaton on map:

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Listing cities & postcodes (1):
>> South Australia, 5023 Seaton, SA CITY SUBS, GPS coordinates: -34.9,138.5167