Average GPS coordinates for Yamaguchi Postcode location: 35.098, 134.905. (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):
>> Hyougoken, 673-1471 Yamaguchi, Katougunyashirochou, GPS coordinates: 34.9197,134.9853
>> Hyougoken, 679-1325 Yamaguchi, Takagunkamichou, GPS coordinates: 35.1479,134.9335
>> Hyougoken, 679-3432 Yamaguchi, Asagogun'Asagochou, GPS coordinates: 35.2259,134.7968