Prosečne GPS koordinate za poštanski broj 18109: 40.637, -75.441
Spisak gradova:
>> Allentown 18109, Pennsylvania, Lehigh, GPS koordinate: 40.6366,-75.4405
Spisak gradova:
>> Allentown 18109, Pennsylvania, Lehigh, GPS koordinate: 40.6366,-75.4405