1987 Aragonese regional election

The Cortes of Aragon were the devolved, unicameral legislature of the autonomous community of Aragon, having legislative power in regional matters as defined by the Spanish Constitution and the Aragonese Statute of Autonomy, as well as the ability to vote confidence in or withdraw it from a regional president.{{cite act |title=Ley Orgánica 8/1982, de 10 de agosto, de Estatuto de Autonomía de Aragón |type=Organic Law |number=8 |work=Boletín Oficial del Estado |language=es |date=10 August 1982 |url=https://www.boe.es/buscar/doc.php?id=BOE-A-1982-20819 |access-date=17 September 2017}}

Voting for the Cortes was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered in Aragon and in full enjoyment of their political rights. The 67 members of the Cortes of Aragon were elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of three percent of valid votes—which included blank ballots—being applied in each constituency. Seats were allocated to constituencies, corresponding to the provinces of Huesca, Teruel and Zaragoza, with each being allocated an initial minimum of 13 seats and the remaining 28 being distributed in proportion to their populations (provided that the seat-to-population ratio in the most populated province did not exceed 2.75 times that of the least populated one).{{cite act |title=Ley 2/1987, de 16 de febrero, Electoral de la Comunidad Autónoma de Aragón |type=Law |number=2 |work=Boletín Oficial del Estado |language=es |date=12 February 1987 |url=https://www.boe.es/buscar/act.php?id=BOE-A-1987-5339&tn=1&p=19870218 |access-date=17 September 2017}}

In smaller constituencies, the use of the electoral method resulted in an effective threshold based on the district magnitude and the distribution of votes among candidacies.{{cite web |last=Gallagher |first=Michael |date=30 July 2012 |url=http://www.tcd.ie/Political_Science/staff/michael_gallagher/ElSystems/Docts/effthresh.php |archive-url=https://web.archive.org/web/20170730092518/http://www.tcd.ie/Political_Science/staff/michael_gallagher/ElSystems/Docts/effthresh.php |url-status=dead |archive-date=30 July 2017 |title=Effective threshold in electoral systems |publisher=Trinity College, Dublin |access-date=22 July 2017}}

The term of the Cortes of Aragon expired four years after the date of their previous election. The election decree was required to be issued no later than the twenty-fifth day prior to the date of expiry of parliament and published on the following day in the Official Gazette of Aragon (BOA), with election day taking place between the fifty-fourth and the sixtieth day from publication. The previous election was held on 8 May 1983, which meant that the legislature's term would have expired on 8 May 1987. The election decree was required to be published in the BOA no later than 14 April 1987, with the election taking place no later than the sixtieth day from publication, setting the latest possible election date for the Cortes on Saturday, 13 June 1987.{{cite act |title=Ley Orgánica 5/1985, de 19 de junio, del Régimen Electoral General |type=Organic Law |number=5 |work=Boletín Oficial del Estado |language=es |date=19 June 1985 |url=https://www.boe.es/buscar/act.php?id=BOE-A-1985-11672&tn=1&p=19870403 |access-date=28 December 2016}}

The Cortes of Aragon could not be dissolved before the date of expiry of parliament except in the event of an investiture process failing to elect a regional president within a two-month period from the first ballot. In such a case, the Cortes were to be automatically dissolved and a snap election called, with elected deputies merely serving out what remained of their four-year terms.

The electoral law allowed for parties and federations registered in the interior ministry, coalitions and groupings of electors to present lists of candidates. Parties and federations intending to form a coalition ahead of an election were required to inform the relevant Electoral Commission within ten days of the election call, whereas groupings of electors needed to secure the signature of at least one percent of the electorate in the constituencies for which they sought election, disallowing electors from signing for more than one list of candidates.

Below is a list of the main parties and electoral alliances which contested the election:

The table below lists voting intention estimates in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a poll. When available, seat projections determined by the polling organisations are displayed below (or in place of) the percentages in a smaller font; 34 seats were required for an absolute majority in the Cortes of Aragon.

{{bar box

|title=Popular vote

|titlebar=#ddd

|width=550px

|barwidth=500px

|bars=

{{bar percent|PSOE|{{party color|Socialists' Party of Aragon}}|35.68}}

{{bar percent|PAR|{{party color|Regionalist Aragonese Party}}|28.14}}

{{bar percent|AP|{{party color|People's Alliance (Spain)}}|15.49}}

{{bar percent|CDS|{{party color|Democratic and Social Centre (Spain)}}|10.23}}

{{bar percent|CAA–IU|{{party color|United Left of Aragon}}|4.90}}

{{bar percent|PTE–UC|{{party color|Workers' Party of Spain–Communist Unity}}|1.32}}

{{bar percent|PDP|{{party color|People's Democratic Party (Spain)}}|1.23}}

{{bar percent|Others|#777777|1.57}}

{{bar percent|Blank ballots|#DDDDDD|1.44}}

}}

{{bar box

|title=Seats

|titlebar=#ddd

|width=550px

|barwidth=500px

|bars=

{{bar percent|PSOE|{{party color|Socialists' Party of Aragon}}|40.30}}

{{bar percent|PAR|{{party color|Aragonese Party}}|28.36}}

{{bar percent|AP|{{party color|People's Alliance (Spain)}}|19.40}}

{{bar percent|CDS|{{party color|Democratic and Social Centre (Spain)}}|8.96}}

{{bar percent|CAA–IU|{{party color|United Left of Aragon}}|2.99}}

}}

{{notelist}}

;Opinion poll sources

{{reflist|group="p"}}

;Other

{{reflist}}

{{Aragonese elections}}

{{Regional elections in Spain in the 1980s}}

Category:1987 in Aragon

Aragon

Category:Regional elections in Aragon

Category:June 1987 in Europe