Uttar Pradesh's ruling BJP was leading in the Gorakhpur Lok Sabha constituency while the opposition SP was ahead in Phulpur after three hours of counting for the parliamentary by-elections, Election Commission officials said.
In Phulpur, SP's Nagendra Pratap Singh Patel was ahead by 3,600 votes with BJP's Kaushalendra Singh Patel trailing behind him.
The results are expected to be declared by afternoon, an EC official said.
Ten nominees were in the fray from Gorakhpur, while 22 candidates contested from Phulpur.
The bypolls were necessitated after Adityanath and his Deputy Chief Minister Keshav Prasad Maurya vacated the Gorakhpur and Phulpur Lok Sabha seats respectively, following their election to the state legislative council.
Phulpur, once represented by the country's first prime minister Jawaharlal Nehru, witnessed a saffron surge in the 2014 Lok Sabha election when Maurya won the seat.
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