Hayır, 34380 ve 34387 posta kodları aynı değildir.
34380, Şişli'deki Cumhuriyet Mahallesi'nin posta kodudur 12. 34387 ise Mecidiyeköy, Şişli'deki Kuştepe, Mecidiyeköy ve İzzetpaşa mahallelerinin posta kodudur 35.
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