Average GPS coordinates for Oka Postcode location: 35.035, 134.911. (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):
>> Hyougoken, 669-5246 Oka, Asagogunwadayamachou, GPS coordinates: 35.3466,134.8103
>> Hyougoken, 675-1113 Oka, Kakogun'Inamichou, GPS coordinates: 34.7376,134.9193
>> Hyougoken, 679-0313 Oka, Takagunkurodashouchou, GPS coordinates: 35.0213,135.0025