Average GPS coordinates for La Union Postcode location: 23.658, -99.183. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). La Union on map:

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Listing cities & postcodes (4):
>> Tamaulipas, 87345 La Union, Matamoros, Matamoros (heroica Matamoros), GPS coordinates: 24.5667,-98.3
>> Tamaulipas, 87929 La Union, Tula, GPS coordinates: 23,-99.5333
>> Tamaulipas, 87937 La Union, Jaumave, GPS coordinates: 23.5333,-99.45
>> Tamaulipas, 89602 La Union, Altamira, Altamira, GPS coordinates: 23.5333,-99.45