Prosečne GPS koordinate za poštanski broj 18104: 40.602, -75.523
Spisak gradova:
>> Allentown 18104, Pennsylvania, Lehigh, GPS koordinate: 40.6018,-75.5225
Spisak gradova:
>> Allentown 18104, Pennsylvania, Lehigh, GPS koordinate: 40.6018,-75.5225