Average GPS coordinates for Istmeña Postcode location: 16.659, -95.967. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Istmeña on map:

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Listing cities & postcodes (2):
>> Oaxaca, 70380 Istmeña, El Barrio de La Soledad, Lagunas Estacion, GPS coordinates: 16.6958,-95.7825
>> Oaxaca, 70680 Istmeña, Salina Cruz, Salina Cruz, GPS coordinates: 16.6219,-96.1522