Prosečne GPS koordinate za poštanski broj 26018: 16.308, -93.333

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Spisak gradova:
>> La Esperanza 26018, Coahuila De Zaragoza, Piedras Negras, Piedras Negras, GPS koordinate: 16.4,-93.3
>> Santa Maria 26018, Coahuila De Zaragoza, Piedras Negras, Piedras Negras, GPS koordinate: 16.2167,-93.3667
>> Sector Sanitario 26018, Coahuila De Zaragoza, Piedras Negras, Piedras Negras, GPS koordinate: 16.3083,-93.3333