Average GPS coordinates for San Juan Postcode location: 23.8, -98.825. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). San Juan on map:

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Listing cities & postcodes (2):
>> Tamaulipas, 87446 San Juan, Matamoros, Matamoros (heroica Matamoros), GPS coordinates: 24.35,-98.6167
>> Tamaulipas, 87904 San Juan, Tula, GPS coordinates: 23.25,-99.0333