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

[2] The expat vote system was attributed responsibility for a major decrease in the turnout of Spaniards abroad during the years it had been in force.

[3] All members of the Cortes of Castile and León are elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of three percent of valid votes—which includes blank ballots—being applied in each constituency.

[5] The term of the Cortes of Castile and León expires four years after the date of their previous election, unless they are dissolved earlier.

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