Gjennomsnittlig GPS-koordinater for postnummer 78520: 49.017, 1.695

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Notering byer:
>> Follainville-Dennemont 78520, Île-de-France, Yvelines, Arrondissement de Mantes-la-Jolie, GPS-koordinater: 49.0219,1.7133
>> Guernes 78520, Île-de-France, Yvelines, Arrondissement de Mantes-la-Jolie, GPS-koordinater: 49.0112,1.6368
>> Limay 78520, Île-de-France, Yvelines, Arrondissement de Mantes-la-Jolie, GPS-koordinater: 48.9955,1.7408
>> Saint-Martin-la-Garenne 78520, Île-de-France, Yvelines, Arrondissement de Mantes-la-Jolie, GPS-koordinater: 49.041,1.6893