Prosečne GPS koordinate za poštanski broj 20774: 38.868, -76.816
Spisak gradova:
>> Upper Marlboro 20774, Maryland, Prince George's, GPS koordinate: 38.8682,-76.8156
Spisak gradova:
>> Upper Marlboro 20774, Maryland, Prince George's, GPS koordinate: 38.8682,-76.8156