Average GPS coordinates for Koizumi Postcode location: 35.609, 140.391. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Koizumi on map:

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Listing cities & postcodes (3):
>> Chibaken, 286-0823 Koizumi, Naritashi, GPS coordinates: 35.8127,140.3626
>> Chibaken, 289-1317 Koizumi, Sanbugunnarutoumachi, GPS coordinates: 35.5937,140.4407
>> Chibaken, 299-4347 Koizumi, Chouseigunchouseimura, GPS coordinates: 35.4196,140.3701