[1] As of the 2018 Chengannur Assembly Bypoll, the current MLA is Saji Cherian of CPI(M).

Chengannur Niyamasabha constituency is composed of the following local self governed segments:[2] The following list contains all members of Kerala legislative assembly who have represented the constituency: Key CPI(M)  INC  Independent  CPI  IC(S) Sabha Percentage change (±%) denotes the change in the number of votes from the immediately previous election.

Due to the death of the sitting MLA K. K. Ramachandran Nair, Chengannur Niyamasahba constituency went to bypoll on 28 March 2018.

There were 2,00,137 registered voters in the constituency for the by-election.

[3][4] There were 1,97,372 registered voters in the constituency for the 2016 Kerala Niyamasabha Election.