Sources said the Election Commission has made security arrangements with special focus on Naxal-hit areas in Maharashtra to ensure peaceful polling, which will start at 7 am in all the three states.
The EC has deployed as many as 18,000 central police forces in Maharashtra alone to ensure peaceful polling.
Congress President Sonia Gandhi, party general secretary Rahul Gandhi and Prime Minister Manmohan Singh are making efforts to retain power.
Senior BJP leaders L K Advani, Rajnath Singh, Sushma Swaraj, Arun Jaitley and M Venkaiah Naidu were the opposition who campaigned vigorously.
Congress is seeking to retain power in Maharashtra with its ally NCP for a third consecutive term, while the Shiv Sena-BJP combine is also trying its best to wrest power in the state.