Thursday's balloting covered all 20 Lok Sabha constituencies in Kerala, 10 each in Uttar Pradesh, Haryana, Maharashtra and Odisha, nine in Madhya Pradesh, all seven seats in Delhi, six in Bihar, four in Jharkhand and one each in Chhattisgarh, Jammu, Chandigarh, Lakshwadeep as well as Andaman and Nicobar Island.
Congress president Sonia Gandhi, her son and party vice president Rahul Gandhi and AAP leader Arvind Kejriwal voted in separate polling centres in the national capital. Former BJP president Nitin Gadkari voted in Nagpur.
After voting, a smiling Gandhi flashed her inked finger but did not speak to the media.
Congress leader Ajay Maken, who was with her, earlier claimed that voters were sure to reward the Congress-led UPA with another five-year term.
Kejriwal said after voting that he was confident the AAP would win all seven seats in Delhi where he was chief minister for 49 days until Feb 14.
BJP leader Harsh Vardhan was equally confident that the Bharatiya Janata Party was set to sweep most Lok Sabha seats in contention Thursday due to the "(Narendra) Modi wave".
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