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. 23 seats are required for an absolute majority in the General Council of the Principality of Asturias.
After the election, the leader of the Asturian PSOE, Javier Fernández Fernández, and the incumbent Asturian President, Francisco Álvarez Cascos, were tasked to form a coalition government. The election led to a political impasse as the left (PSOE and IU) and the right (FAC and PP) each gained 22 seats in the election (23 seats are required for a majority in the 45-seat Assembly). The remaining seat was held by the centrist UPyD, which became the kingmaker in the negotiation.
The coalition talks took almost two months to reach an agreement. One of the main events during the negotiation was the legal battle in the Spanish Constitutional Court over the 45th seat, the assignment of which was delayed by counting of absentee ballots. The FAC disputed the seat's assignment to the PSOE and asked for a revote. The Constitutional Court rejected the appeal and upheld the seat for the PSOE.
The UPyD finally agreed to form a government with PSOE. Their main reason to enter the coalition was the threat by Minister of Finance Cristóbal Montoro Romero to intervene in Asturian government accounts. On 23 May 2012, PSOE leader Javíer Fernandez was elected as the new president of the Principality of Asturias with support of the IU and UPyD.
^ abPoll results are shown 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 polls, a rule of three has been applied to the poll projections, with the results of the calculation being shown instead.