Average GPS coordinates for Rio Postcode location: 24.219, -98.696. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Rio on map:

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Listing cities & postcodes (2):
>> Tamaulipas, 87360 Rio, Matamoros, Matamoros (heroica Matamoros), GPS coordinates: 24.1833,-98.6583
>> Tamaulipas, 87409 Rio, Matamoros, Matamoros (heroica Matamoros), GPS coordinates: 24.2545,-98.7333