Gjennomsnittlig GPS-koordinater for postnummer 78666: 29.875, -97.94
Notering byer:
>> San Marcos 78666, Texas, Hays, GPS-koordinater: 29.8754,-97.9404
Notering byer:
>> San Marcos 78666, Texas, Hays, GPS-koordinater: 29.8754,-97.9404