The service sector provides most employment in the town. Limited agriculture is carried out; the main crop is
paddy rice. During the British Raj, Sirkazhi was known for mats made with a kind of
cyperus. The headquarters of the
taluka and
panchayat union administration, and many government offices are located in the town. There are no major industries within the town, except for several rice mills. Sirkazhi has many Hindu temples, which draw in tourism activity. Sirkali Coop Urban Bank, founded on 23 April 1918 is the oldest bank in Sirkali. All major
nationalised banks and private banks have branches in the town, and all have
atms. The National highway NH-32 connects Chennai and Thoothukudi through
Chidambaram,
Cuddalore and
Nagapattinam passes through Sirkazhi. Sirkazhi has outer bypass road to ease the transport of heavy vehicles in the town. Sirkazhi municipality has of roads: of BT roads, of cement roads, of water-bound
macadam surface and of other roads.
Bullock carts are the traditional mode of transport; as late as the 1950s, landlords and rich farmers travelled mostly by bullock carts except on rare, long journeys, which they undertook by buses or motor vehicles. Buses are the main mode of public transport from Sirkazhi. The municipality operates a B-Class bus stand with 36 bays that accommodate local and intercity buses. The buses are operated by
Tamil Nadu State Transport Corporation, connecting the town to
Mayiladuthurai,
Kumbakonam,
Nagapattinam,
Chidambaram,
Karaikkal and other cities in Tamil Nadu. Nearest major junction of
Mayiladuthurai, the
Sirkazhi's railway station is on the main line between Chennai and
Trichy via
Cuddalore and Chidambaram. Daily express trains connect major cities in Tamil Nadu like
Chennai,
Madurai and
Trichy, and weekly express trains connect Tirupathi,
Varanasi,
Tiruchendur and
Bhubaneswar. There are also daily passenger trains to Mayiladuthurai,
Salem,
Villupuram and
Bangalore daily. The nearest airport is
Tiruchirapalli Airport which is from Sirkazhi. ==Education and utility services==