Average GPS coordinates for San Mateo Postcode location: 17.775, -96.975. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Mateo on map:

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Listing cities & postcodes (2):
>> Oaxaca, 68575 San Mateo, San Mateo Yoloxochitlan, GPS coordinates: 18.15,-96.85
>> Oaxaca, 69005 San Mateo, Heroica Ciudad de Huajuapan de Leon, Huajuapan de Leon, GPS coordinates: 17.4,-97.1