Average GPS coordinates for Seaford Postcode location: -35.183, 138.467. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seaford on map:

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Listing cities & postcodes (1):
>> South Australia, 5169 Seaford, SA CITY SUBS, GPS coordinates: -35.1833,138.4667