[1] Voting for the Parliament is on the basis of universal suffrage, which comprises all nationals over 18 years of age, registered in Cantabria and in full enjoyment of their political rights.

The 35 members of the Parliament of Cantabria are elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of five percent of valid votes—which includes blank ballots—being applied regionally.

[1][2][3] The president has the prerogative to dissolve the Parliament of Cantabria and call a snap election, provided that no motion of no confidence is in process, no nationwide election is due and some time requirements are met: namely, that dissolution does not occur either during the first legislative session or within the legislature's last year ahead of its scheduled expiry, nor before one year has elapsed since a previous dissolution.

The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.

The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a poll.