It is a bicameral body, comprising the Chamber of Deputies of Catamarca (41 representative), and the Senate of Catamarca (16 members).

[1][2] It is elected by a general provincial first-past-the-post voting (Senate) and proportional representation for the Chamber, renewed every 2 years by electing a new half of each house.

Each representative serves a four-year term.

The Provincial Constitution denotes its legislative powers.

[3] The Legislature meets in the provincial capital.