
TMC's Sunil Singh has won the Naopara assembly seat in West Bengal with 1,11,729 votes.
Congress's Vivek Dhakad has won Mandalgarh assembly seat by 12976 votes.
As of now, the Congress leads in Ajmer and Alwar parliamentary seats in Rajasthan. TMC leads in West Bengal'sUluberia.
The counting began at 8 am today amid tight security.
According to reports, Congress' Karan Singh Yadav was leading by 61,500 votes over BJP's Jaswant Yadav in Alwar.
In Ajmer, Congress's Raghu Sharma was ahead of BJP's Ram Swaroop Lamba by 3,398 votes, they said.
In Mandalgarh, BJP candidate Shakti Singh Hada was ahead of independent candidate Gopal Malviya by over 3,000 votes. Congress' Vivek Dhakad was trailing.
Chief Election Officer Ashwani Bhagat said the results would be declared before noon.
The polling in all the constituencies took place on Monday.
The election was held for Ajmer and Alwar Lok Sabha seats and Mandalgarh Assembly constituency in Rajasthan.
All the three seats fell vacant after the death of Ajmer MP Sanwar Lal Jat, Alwar MP Chand Nath and Mandalgarh MLA Kirti Kumari, who all were from the Bharatiya Janata Party (BJP).
While in West Bengal, by-polls were held for Uluberia Lok Sabha Constituency in Howrah district and Noapara Assembly Seat in North 24 Parganas.
The election was necessitated due to the death of the Trinamool Congress (TMC) MP Sultan Ahmed and the Congress party MLA Madhusudan Ghosh.
(With inputs from agencies)