What is the postal code of Nasr city in Cairo Egypt?

There are three post offices in Nasr City dividing it into three sectors each with its individual Postal Code and they are as follows:

11371 (Masaken El Bareed Post Office, Northern parts of Nasr City)

11471 (Sixth District Post Office, South-West of Nasr city)

11528 (Tenth District Post Office, South-East of Nasr City)