Gjennomsnittlig GPS-koordinater for postnummer 21311: 2.965, 99.8
Notering byer:
>> Tanjung Balai Kota I 21311, North Sumatra, Tanjung Balai, GPS-koordinater: 2.96507,99.80028
Notering byer:
>> Tanjung Balai Kota I 21311, North Sumatra, Tanjung Balai, GPS-koordinater: 2.96507,99.80028