The number of seats in the regional Courts was determined by the population count. For the 2011 election, the Courts size was set to 84 seats. All Courts members were elected in 9 multi-member districts, corresponding to Castile and León's nine provinces, using the D'Hondt method and a closed-listproportional representation system. Each district was entitled to an initial minimum of 3 seats, with 1 additional seat per each 45,000 inhabitants or fraction greater than 22,500. For the 2011 election, seats were distributed as follows: Avila (7), Burgos (11), Leon (14), Palencia (7), Salamanca (11), Segovia (7), Soria (5), Valladolid (15) and Zamora (7).
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. The lead column on the right shows the percentage-point difference between the two parties with the highest figures. Poll results use the date the survey's fieldwork was done, as opposed to the date of publication. However, if such date is unknown, the date of publication will be given instead.
Opinion polls showing seat projections are displayed in the table below. The highest seat figures in each polling survey have their background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. 43 seats were required for an absolute majority in the Courts of Castile and León.
43 seats needed for majority (01/01/2010–22/05/2011)
42 seats needed for majority (27/05/2007–01/01/2010)
^This survey shows its poll results projected over candidacy votes (that is, votes going for political parties, excluding blank ballots). The vote percentage in the official election is calculated including blank ballots into the estimation. In order to obtain data comparable to both the official results as well as those of other surveys, a rule of three has been applied to the survey projections, with the results of the calculation being shown instead.