Voting is taking place in 28 seats in Karnataka state, followed by Rajasthan (20), Maharashtra (19), Uttar Pradesh and Odisha (11 each), Madhya Pradesh (10), Bihar (seven), Jharkhand (six), West Bengal (four), Chhattisgarh (three), Jammu and Kashmir and Manipur (one each).
India is witnessing the biggest round of electoral exercise on April 17. With this phase the voting will cross the half-way mark in terms of seats in more than a month-long exercise.
The world's biggest ever election is taking place in nine stages from April 7 to May 12, with results due on May 16.
More than 25 bigwigs are trying their luck in Thursday's fifth phase of polling. Nandan Nilekani, Maneka Gandhi, former Prime Minister HD Deve Gowda, Union Minister Veerappa Moily and Lalu Prasad's eldest daughter Misa Bharti are amongst the 1,769 candidates in the fifth of the nine-phased elections.
Of the total seats, Congress has 36 while its main challenger, while the BJP has 40.
So far, polling has been held in 111 constituencies in four phases. In the last substantial round, 91 seats went to polls on April 10.