Average GPS coordinates for Mannum Postcode location: -34.915, 139.303. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Mannum on map:

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Listing cities & postcodes (1):
>> South Australia, 5238 Mannum, SA SUBS NEAR 2, GPS coordinates: -34.9153,139.3033