Postal code usually consists of a sequence of letters and numbers, or numbers only, and is appended to the end of an address. Postal Code identifies an addressee’s location and assists in the transmission, sorting and delivery of mail items.
On 21 March 2011, Afghan Post introduced a new postcode system and domestic addressing standard. Under the new system, postcodes consist of four digits: the first two digits (ranging from 10–43) correspond to the province, while the last two digits correspond either to the city/delivery zone (range 01–50) or to the district/delivery zone (range 51–99). For more information click here