Average GPS coordinates for Yamaguchi Postcode location: 34.448, 135.848. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Yamaguchi on map:

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Listing cities & postcodes (3):
>> Naraken, 633-2139 Yamaguchi, Udagun'Ooudachou, GPS coordinates: 34.4575,135.9513
>> Naraken, 639-2134 Yamaguchi, Kitakatsuragigunshinjouchou, GPS coordinates: 34.4719,135.7037
>> Naraken, 639-3101 Yamaguchi, Yoshinogunyoshinochou, GPS coordinates: 34.414,135.89