PIN refers to the Postal Index Number. As the name indicates, this number is given by the postal department for indexing a particular area. This code contains 6 digits where each number indicates the district, sub district and so on. The last 2 digits refer to the sorting code of a particular area. For postal code purposes, Madhya Pradesh is divided into East Madhya Pradesh, Gangtok, North Madhya Pradesh, South Madhya Pradesh and West Madhya Pradesh areas. There are over 50 Pincodes in East Madhya Pradesh, 3 in Gangtok, around 20 in North Madhya Pradesh, around 30 in South Madhya Pradesh and close to 30 codes in West Madhya Pradesh area.