As per orders of the Delimitation Commission, 121 Haroa Assembly constituency is composed of the following: Falti Beleghata, Dadpur, Kiritipur I, Kiritipur II, Shashan gram panchayats of Barasat II community development block, Champatala, Deganga I, Deganga II, Hadipur Jhikra II gram panchayats of Deganga community development block, and 3.

In the 2006 state assembly elections,[15] Asim Kumar Das of CPI(M) won the 97 Haroa (SC) assembly seat defeating his nearest rival Mrityunjoy Mondal of Trinamool Congress.

Contests in most years were multi cornered but only winners and runners are being mentioned.

[7] Brajendra Nath Sarkar of Bangla Congress won in 1969.

[3] In independent India's first election in 1951, Jyotish Chandra Roy Sardar of Congress and Hemanta Kumar Ghoshal of CPI won the Haroa Sandeshkhali joint seat.