Prosečne GPS koordinate za poštanski broj 300-1276: 35.992, 140.09
Spisak gradova:
>> Koyama 300-1276, Ibarakiken, Tsukubashi, GPS koordinate: 35.9916,140.0902
Spisak gradova:
>> Koyama 300-1276, Ibarakiken, Tsukubashi, GPS koordinate: 35.9916,140.0902