Average GPS coordinates for Honmachi Postcode location: 35.702, 139.513. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Honmachi on map:

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Listing cities & postcodes (3):
>> Toukyouto, 151-0071 Honmachi, Shibuyaku, GPS coordinates: 35.6841,139.6806
>> Toukyouto, 183-0027 Honmachi, Fuchuushi, GPS coordinates: 35.6659,139.474
>> Toukyouto, 208-0004 Honmachi, Musashimurayamashi, GPS coordinates: 35.7563,139.3841