Avadi is a neighbourhood of Chennai, India. It became a new Municipal Corporation in the Chennai Metropolitan Area and became city corporation of Tamil Nadu in 2019. The neighbourhood lies to the west of Chennai, about 24 km west of Chennai Central Railway Station. It is part of Thiruvallur district and is surrounded by major defence establishments and is home to various universities and engineering colleges. The neighbourhood is served by Avadi Railway Station of the Chennai Suburban Railway. As of 2011, Avadi had a population of 345,996. It is home to the Heavy Vehicles Factory (HVF). It is one of the most populous and developed areas in Chennai.