Average GPS coordinates for Bianko Postcode location: 5.785, 7.147. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Bianko on map:

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Listing cities & postcodes (1):
>> Imo, 475120 Bianko, Ideato South, GPS coordinates: 5.78511, 7.14723