Till 9 AM, voter turnout of 20.10 per cent was recorded from Hooghly district, 20.04 per cent in South 24 Parganas while Kolkata South had the lowest turnout with 15.64 per cent.
The Election Commission said the overall average turnout was 19.64 per cent.
Altogether 349 candidates, including 43 women, are trying their luck in today's election across three districts - Kolkata South, South 24 Parganas and Hooghly.
The centre of attraction in this phase is Bhawanipur constituency where the West Bengal Chief Minister is pitted against former union minister Deepa Dasmunshi of the Congress.
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The other prominent candidate in Bhawanipur is Chandra Kumar Bose, grand nephew of Netaji Subhas Chandra Bose, contesting on a BJP ticket.
Apart from deploying a strong contingent of 90,000 personnel of central and state police forces, the poll panel has also ordered imposition of prohibitory orders under Section 144 CrPc in all constituencies on polling day.
A number of political heavyweights and key ministers like Subrata Mukherjee, Firhad Hakim, Manish Gupta, Partha Chatterjee, Javed Ahmed Khan and city mayor Sovan Chatterjee will try their luck in this phase of election.