As per orders of the Delimitation Commission, No. 174 Sankrail (Vidhan Sabha constituency) (SC) is composed of the following: Andul, Banpur I, Banpur II, Dakshin Sankrail, Dhulagari, Kandua, Manikpur, Mashila, Nalpur, Raghudebbati, Sankrail, Sarenga gram panchayats of Sankrailcommunity development block and Kolora I, Kolora II, Mahiyari I, Mahiyari II gram panchayats of Domjur community development bloc.
In the 2006, 2001 1996 state assembly elections, Sital Kumar Sardar of Trinamool Congress / Congress won the 169 Sankrail (SC) assembly seat, defeating his nearest rivals Anirban Hazara of CPI(M) in 2006, Bikash Mondal of CPI(M) in 1996, and Basudeb Dhali of CPI(M) in 1996. Contests in most years were multi cornered but only winners and runners are being mentioned. Haran Hazra of CPI(M) defeated Nityananda Bhuniya of Congress/ Janata Party in 1991, 1987, 1982 and 1977.
Haran Hazra of CPI(M) won in 1972, 1971 and 1969. N.N.Bhuniya of Congress won in 1967. Dulal Chandra Mondal of CPI won in 1962. In 1957 and 1951 Sankrail had joint seats. Shyama Prasanna Bhattacharya of CPI and Apurbalal Mazumdar of Forward Bloc (Marxist) won in 1957. Kanai Lal Bhattacharya and Kripa Sindhu Shaw, both of Forward Bloc (Ruiker), won in 1951.