34303, İstanbul'un Küçükçekmece ilçesindeki Halkalı Merkez Mahallesi'nin posta kodudur. Ayrıca, Halkalı Merkez Mahallesi'nin yanı sıra, Halkalı semtine bağlı İstasyon Mahallesi ve Yarımburgaz Mahallesi'nin de posta kodu 34303'tür.
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