The constituency was previously known as
Paravur Assembly constituency. It was temporarily merged with
Varkala Assembly constituency in 1957. Because of the merger, Varkala Assembly constituency became a two-member constituency during the legislative assembly election of 1957 and interim election of 1960. Later in 1967, the new constituency was carved out of Varkala and was named as
Chathannoor Assembly constituency. The MLA office was shifted from
Paravur to
Chathannoor. In 1967,
P. Ravindran of
CPI became the first elected member from Chathannoor Assembly constituency. ==Structure==