It is said that the origin of the name Chemlan goes back to the Syriac language and means “perfection and wonderful scene” and it also means reunion. Its history dates back to Tanoukhi era in the twelfth century, then its ownership shifted in the early nineteenth century to Amir Haider Al Chahabi, Prince Bashir Al Chahabi great adviser and historian of his time where contacts between them were weekly through Jisr El Kadi. Tanks to Amir Haider Al Chahabi, people began to flock to Chemlan to work for him and plant his fields and some of the families that have resided permanently in the town were Heti, Tabib, Jabbour, Farajallah, Eid and Mokaddem. There are many known figures in Chemlan like Dr. Philip Heti, Dr. Joseph Heti, Edmond Heti, Ibrahim Heti and others.

The municipality was formed in 1909.

The total area of ​​the town is about 1200 square kilometres and it is located on mountainous slopes covered with pine trees in West Lebanon Mountain Range. The town is characterized by its clean environment and moderate climate, rising 700 meters above sea level.  To the east, it is bordered by Kayfoun; to the west, it is bordered by the town of Bchamoun, while it is bordered by Ain Anoub and Atyat to the north and Ainab to the south.

The population of permanent residents of the town is about 350 people, and this number increased to 400 people in summer, in addition to 80% of expatriates. The number of registered voters is 600.

The most known social and cultural institutions is Chemlan Social Foundation, which was founded in 1998 to serve people who suffer from mental delays and learning difficulties, it is a charitable institution for care, development, and participation which offers diverse services and programs emanating from the needs of society, especially those with special needs, intellectual disabilities and learning difficulties.

The majority of the permanent residents of the town work in jobs in public and private sectors and liberal professions. The local economic euphoria is associated with securing the needs of the town in the form a number of small and medium businesses and shops. The other economic sectors are limited. The most prominent type of plantations is olive plantation. Chemlan is known also for its tourist landmarks including ancient Roman ruins, an old mill and others. Al Sakhra Restaurant is one of famous restaurants in the region.