Prosečne GPS koordinate za poštanski broj 78280: 48.773, 2.074
Spisak gradova:
>> Guyancourt 78280, Île-de-France, Yvelines, Arrondissement de Versailles, GPS koordinate: 48.7733,2.0739
Spisak gradova:
>> Guyancourt 78280, Île-de-France, Yvelines, Arrondissement de Versailles, GPS koordinate: 48.7733,2.0739