Average GPS coordinates for 30 Postcode location: 18.688, -99.1. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). 30 on map:

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Listing cities & postcodes (1):
>> Morelos, 62776 30, Tlaltizapan, GPS coordinates: 18.6883,-99.1