Sirkazhi is a municipal town in Nagapattinam district in Tamil Nadu, India. It is located 13 km (8.1 mi) from the coast of the Bay of Bengal, and 250 km (160 mi) from the state capital Chennai. Sirkazhi was a part of Thanjavur district until 1991 and has later been part of Nagapattinam district. The town covers an area of 13.21 km2 (5.10 sq mi) and in 2011 had a population of 34,927. It is administered by a second-grade municipality. Sirkazhi is part of the Cauvery delta region and agriculture is the major occupation. Roads are the main means of transportation; the town has 51.47 km (31.98 mi) of district roads, including a national highway.