Average GPS coordinates for Dereköy Postcode location: 40.25, 36.25. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Dereköy on map:

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Listing cities & postcodes (1):
>> Kocaeli, 41780 Dereköy, Tütünçiftlik, Köyler, GPS coordinates: 40.25,36.25