Average GPS coordinates for Oka Postcode location: 34.984, 133.965. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Oka on map:

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Listing cities & postcodes (3):
>> Okayamaken, 709-0702 Oka, Akaiwagunkumayamachou, GPS coordinates: 34.8155,134.0686
>> Okayamaken, 709-4311 Oka, Katsutagunshououchou, GPS coordinates: 35.0364,134.1245
>> Okayamaken, 717-0015 Oka, Maniwagunkatsuyamachou, GPS coordinates: 35.1012,133.7024