Average GPS coordinates for Roma Postcode location: 17.296, -96.837. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Roma on map:

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Listing cities & postcodes (2):
>> Oaxaca, 71236 Roma, San Antonio de La Cal, GPS coordinates: 17.4174,-96.8308
>> Oaxaca, 71830 Roma, Villa de Tututepec de Melchor Ocampo, Rio Grande, GPS coordinates: 17.1749,-96.8425