It is the headquarters of the Poonamallee taluk of the Tiruvallur district in the Indian state of Tamil Nadu.

It is also an important halting point for buses starting from Chennai Mofussil Bus Terminus and going towards Tirupati, Kanchipuram, Vellore, and other cities.

The name "Poonamallee" is derived from the Tamil phrase "poo irundha alli", which means "flower pond".

[3] Saint Thirukatchi nambi in his last days suffered from aged illness and due to his service to Lord varadha of kanchi interrupted.

In the late 19th century, Poonamallee served as a convalescent depot for British troops stationed across the Madras Presidency and Burma, primarily due to its healthy climate.

Additionally, Poonamallee was home to a significant number of European pensioners, mainly retired military personnel.

Poonamallee Municipality is situated in the West Chennai of Tamil Nadu in Thiruvallur District.

This town is surrounded with infrastructural facilities and it is near to visit Chennai Metropolitan Bus Terminal (CMBT).

It has gained importance since this court system dealt with the assassination of former Indian Prime Minister Rajiv Gandhi.

[9] there are three old traditional Catholic churches and a mosque was built and completed by Rustom, son of Dhulfiquer of Astrabad, a servant of Nawab Jumlat-ul-mulk.