Average GPS coordinates for Second Valley Postcode location: -35.55, 138.233. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Second Valley on map:

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Listing cities & postcodes (1):
>> South Australia, 5204 Second Valley, SA SUBS NEAR 2, GPS coordinates: -35.55,138.2333