The electoral system uses the D'Hondt method and a closed-list proportional representation, with a minimum threshold of 3%.

Each constituency is entitled to an initial minimum of two seats, with the remaining 39 being distributed in proportion to their populations.

[2][3] Voting is on the basis of universal suffrage, which comprises all nationals over eighteen, registered in Asturias and in full enjoyment of their political rights.

[4][5] Seats are elected using the D'Hondt method and a closed list proportional representation, with a threshold of three percent of valid votes—which includes blank ballots—being applied in each constituency.

[2][3] The use of the D'Hondt method might result in a higher effective threshold, depending on the district magnitude.