Keylong is the district head quarters of Lahaul and Spifi. At an altitude of 3156 m. Keylong is situated on the main trade route between the Rohtang and Baralacha passes above the Bhaga river. Most of the government offices are located at Keylong. This is also the hub-centre of all commercial activity with a regular bazaar. Naturally Keylong is the most populated and busy village of the Lahaul valley. As far as communication facilities are concerned, there are police and telegraph radio nets, telephone exchange at Keylong and postal service throughout the valley. There are three light TV transmitter has been installed one in Sumnam village, second in Baring & third in Udaipur. In the past Keylong was home for the Moravian missionaries.