Harbour, Constituency No. 18, is a densely populated coastal and inner-city Assembly constituency in North Chennai with a strong political legacy. Former chief minister M. Karunanidhi was elected from Harbour in 1989 and 1991, and senior DMK leader K. Anbazhagan also represented the constituency twice. In the 2021 Assembly elections, DMK’s PK Sekarbabu won the seat with 59,317 votes. He had earlier secured victory from the constituency in the 2016 elections with 42,071 votes.