Average GPS coordinates for Rio Postcode location: 42.007, -8.5. (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 (5):
>> Viana do Castelo, 4950-150 Rio, Povoação, Chacim, GPS coordinates: 42.0125,-8.55
>> Viana do Castelo, 4950-630 Rio, Povoação, Lombo, GPS coordinates: 42.0333,-8.4455
>> Viana do Castelo, 4980-252 Rio, Vila Franca do Campo, Mazouco, GPS coordinates: 42.0167,-8.5
>> Viana do Castelo, 4980-290 Rio, Vila Franca do Campo, Poiares, GPS coordinates: 42.0167,-8.5
>> Viana do Castelo, 4990-600 Rio, Ribeira Brava, Lamas, GPS coordinates: 41.9542,-8.5042