38 Kumarganj Assembly constituency covers Kumarganj community development block and Ashokegram, Basuria, Chaloon and Uday gram panchayats of Gangarampur community development block.

[1] In the 2011 elections, Mahamuda Begam of Trinamool Congress defeated her nearest rival Mafuja Khatun of CPI(M).

In the 2006[12] and 2001[11] state assembly elections, Mafuja Khatun of CPI(M) won the Kumarganj assembly seat defeating her nearest rivals Ahmad Ali Sardar and Nani Gopal Roy, both of Trinamool Congress respectively.

[8] Dwijendra Nath Roy of CPI(M) defeated Sekhar Kumar Dasgupta of Congress in 1982.

[7] Jamini Kishore Mojumdar of CPI(M) defeated Khalil Sayed of Congress in 1977.