Average GPS coordinates for Maruyama Postcode location: 37.854, 138.952. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Maruyama on map:

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Listing cities & postcodes (3):
>> Niigataken, 950-0115 Maruyama, Niigatashi, GPS coordinates: 37.8772,139.1246
>> Niigataken, 952-0824 Maruyama, Sadogunhatanomachi, GPS coordinates: 37.9116,138.4597
>> Niigataken, 959-2203 Maruyama, Kitakanbaragunyasudamachi, GPS coordinates: 37.7741,139.2711