Postal codes in Bangladesh are assigned to all areas in the country. And there is only five General Post Offices in Bangladesh, They are: Central General Post office, Dhaka GPO^[1] assigned Code is 1000, Metropolitan General Post office, Metropolitan Dhaka^[2] assigned code is 1100, Eastern General Post office Chattogram GPO^[3] assigned Code 4000, Northern General Post office, Rajshahi GPO ^[4] assigned Code 6000 and Southern General Post office, Khulna GPO^[5] assigned Code is 9000.