Average GPS coordinates for San Marcos Postcode location: -9.439, -72.849. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Marcos on map:

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Listing cities & postcodes (2):
>> Ucayali, 25000 San Marcos, Coronel Portillo, GPS coordinates: -8.66114, -74.15928
>> Ucayali, 25400 San Marcos, Purús, GPS coordinates: -10.21733, -71.53799