Average GPS coordinates for Mars Postcode location: 45.588, 4.287. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Mars on map:

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Listing cities & postcodes (2):
>> Rhône-Alpes, 07320 Mars, Ardèche, Arrondissement de Tournon, GPS coordinates: 45.0224,4.3266
>> Rhône-Alpes, 42750 Mars, Loire, Arrondissement de Roanne, GPS coordinates: 46.1545,4.2468