Prosečne GPS koordinate za poštanski broj 77979: 28.601, -96.626
Spisak gradova:
>> Port Lavaca 77979, Texas, Calhoun, GPS koordinate: 28.6011,-96.6259
Spisak gradova:
>> Port Lavaca 77979, Texas, Calhoun, GPS koordinate: 28.6011,-96.6259