Average GPS coordinates for Oki Postcode location: 6.179, 6.2. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Oki on map:

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Listing cities & postcodes (1):
>> Delta, 321101 Oki, Ika South, GPS coordinates: 6.17936, 6.20043