The department of posts, India exits in the country since the past one hundred and fifty years. It is known for its exceptional service to the nation in the area of communication. The department of posts, government of India, has played a key role in the area of social and economic development of the country. There are one lac fifty five thousand and fifteen post offices in the country. The department of posts released PIN Codes [postal index number] codes on 15th august, 1972. The PIN regions in India are classified and they are 9. The PIN code is a six digit number.