Zaragoza is one of the 52 constituencies represented in the Congress of Deputies, the lower chamber of the Spanish parliament, the . The constituency (whose boundaries correspond to those of the homonymous province) currently elects seven deputies. The electoral system uses the D'Hondt method and closed-list proportional voting, with a minimum threshold of three percent.

Electoral system The constituency was created as per the Political Reform Law and was first contested in the 1977 general election. The Law provided for the provinces of Spain to be established as multi-member districts in the Congress of Deputies,. with this regulation being maintained under the Spanish Constitution of 1978.. Additionally, the Constitution requires for any modification of the provincial limits to be approved under an organic law, needing an absolute majority in the Cortes Generales..

Voting is based on universal suffrage, comprising all Spanish nationals over 18 years of age with full political rights, provided that they have not been deprived of the right to vote by a final sentence.. The only exception was in 1977, when this was limited to nationals over 21 years of age and in full enjoyment of their political and civil rights.; . Amendments in 2011 required non-resident citizens to apply for voting, a system known as "begged" voting ().. which was abolished in 2022. Further, amendments in 2018 granted the right to vote to those legally incapacitated. The Congress of Deputies has a minimum of 300 and a maximum of 400 seats, with electoral provisions fixing its size at 350. Of these, 348 are elected in 50 multi-member constituencies corresponding to the provinces of Spain—each of which is assigned an initial minimum of two seats and the remaining 248 distributed in proportion to population—using the D'Hondt method and closed-list proportional voting, with a three percent-threshold of valid votes (including blank ballots) in each constituency. The remaining two seats are allocated to Ceuta and Melilla as single-member districts elected by plurality voting.; ; ; . The use of this electoral method may result in a higher effective threshold depending on district magnitude and vote distribution. The law does not provide for by-elections to fill vacant seats; instead, any vacancies arising after the proclamation of candidates and during the legislative term are filled by the next candidates on the party lists or, when required, by designated substitutes.; .

The electoral law allows for parties and federations registered in the interior ministry, alliances and groupings of electors to present lists of candidates. Parties and federations intending to form an alliance are required to inform the relevant electoral commission within 10 days of the election call—15 before 1985—whereas groupings of electors need to secure the signature of at least one percent of the electorate in the constituencies for which they seek election—one permille of the electorate, with a compulsory minimum of 500 signatures, until 1985—disallowing electors from signing for more than one list. Also since 2011, parties, federations or alliances that have not obtained a mandate in either chamber of the at the preceding election are required to secure the signature of at least 0.1 percent of electors in the aforementioned constituencies.; . Amendments in 2007 required a balanced composition of men and women in the electoral lists, so that candidates of either sex made up at least 40 percent of the total composition; further amendments in 2024 required the use of a zipper system..

Deputies Deputies 1977–present Legislature Election Distribution Constituent 1977 1 3 1 3 1st 1979 3 1 4 2nd 1982 5 3 3rd 1986 4 1 1 2 4th 1989 1 3 1 2 5th 1993 1 3 1 2 6th 1996 3 4 7th 2000 1 2 4 8th 2004 1 3 3 9th 2008 4 3 10th 2011 1 2 4 11th 2015 1 2 1 3 12th 2016 1 2 1 3 13th 2019 (Apr) 1 3 1 1 1 14th 2019 (Nov) 1 3 2 1 15th 2023 1 2 3 1

General elections 2023 + Summary of the 23 July 2023 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party (PP) 186,776 36.01 +12.65 3 +1 Spanish Socialist Workers' Party (PSOE) 159,858 30.82 -0.03 2 –1 Vox (Vox) 79,376 15.30 –2.69 1 ±0 Unite Aragon (Sumar Aragón)1 69,925 13.48 –2.32 1 ±0 Aragon Exists–Exists Coalition (Existe) 7,780 1.50 New 0 ±0 Aragonese Party (PAR) 2,745 0.53 New 0 ±0 Animalist Party with the Environment (PACMA)2 2,428 0.47 –0.23 0 ±0 Blank Seats to Leave Empty Seats (EB) 2,146 0.41 +0.03 0 ±0 Workers' Front (FO) 1,026 0.20 New 0 ±0 Communist Party of the Workers of Spain (PCTE) 561 0.11 +0.03 0 ±0 For a Fairer World (PUM+J) 419 0.08 –0.01 0 ±0 Federation of Independents of Aragon (FIA) 394 0.08 ±0.00 0 ±0 Zero Cuts (Recortes Cero) 306 0.06 –0.11 0 ±0 Spanish Phalanx of the CNSO (FE de las JONS) 272 0.05 New 0 ±0 Blank ballots 4,693 0.90 –0.07 Total 518,705 7 ±0 Valid votes 518,705 99.10 -0.06 Invalid votes 4,705 0.90 +0.06 Votes cast / turnout 523,410 70.73 +0.74 Abstentions 216,650 29.27 –0.74 Registered voters 740,060 Sources

November 2019 + Summary of the 10 November 2019 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 158,326 30.85 –0.45 3 ±0 People's Party (PP) 119,909 23.36 +5.41 2 +1 Vox (Vox) 92,353 17.99 +5.24 1 ±0 United We Can (Podemos–IU) 57,875 11.28 –2.71 1 ±0 Citizens–Party of the Citizenry (Cs) 47,001 9.16 –11.70 0 –1 More Country–Aragonese Union–Equo (Más País–CHA–Equo) 23,196 4.52 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 3,618 0.70 –0.29 0 ±0 Blank Seats (EB) 1,940 0.38 –0.09 0 ±0 Social Aragonese Movement (MAS) 1,068 0.21 New 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 861 0.17 –0.09 0 ±0 Puyalón (PYLN) 532 0.10 –0.01 0 ±0 For a Fairer World (PUM+J) 485 0.09 –0.05 0 ±0 Communist Party of the Workers of Spain (PCTE) 414 0.08 –0.03 0 ±0 Federation of Independents of Aragon (FIA) 386 0.08 –0.04 0 ±0 Communist Party of the Peoples of Spain (PCPE) 331 0.06 –0.02 0 ±0 Blank ballots 4,989 0.97 +0.09 Total 513,284 7 ±0 Valid votes 513,284 99.16 +0.13 Invalid votes 4,355 0.84 –0.13 Votes cast / turnout 517,639 69.99 –5.85 Abstentions 221,934 30.01 +5.85 Registered voters 739,573 Sources

April 2019 + Summary of the 28 April 2019 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 173,557 31.30 +6.88 3 +1 Citizens–Party of the Citizenry (Cs) 115,651 20.86 +4.02 1 ±0 People's Party (PP) 99,527 17.95 –16.97 1 –2 United We Can (Podemos–IU–Equo) 77,555 13.99 –6.32 1 ±0 Vox (Vox) 70,663 12.75 +12.44 1 +1 Animalist Party Against Mistreatment of Animals (PACMA) 5,469 0.99 +0.01 0 ±0 Blank Seats (EB) 2,626 0.47 –0.12 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,428 0.26 +0.04 0 ±0 For a Fairer World (PUM+J) 749 0.14 New 0 ±0 Federation of Independents of Aragon (FIA) 658 0.12 +0.02 0 ±0 Puyalón (PYLN) 621 0.11 New 0 ±0 Communist Party of the Workers of Spain (PCTE) 589 0.11 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 453 0.08 –0.03 0 ±0 Blank ballots 4,861 0.88 +0.08 Total 554,407 7 ±0 Valid votes 554,407 99.03 –0.19 Invalid votes 5,452 0.97 +0.19 Votes cast / turnout 559,859 75.84 +5.39 Abstentions 178,372 24.16 –5.39 Registered voters 738,231 Sources

2016 + Summary of the 26 June 2016 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party–Aragonese Party (PP–PAR) 179,211 34.92 +4.63 3 ±0 Spanish Socialist Workers' Party (PSOE) 125,321 24.42 +2.14 2 ±0 United We Can in Aragon (Podemos–IU–Equo)1 104,199 20.31 –5.44 1 ±0 Citizens–Party of the Citizenry (C's) 86,434 16.84 –0.98 1 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 5,025 0.98 +0.22 0 ±0 Blank Seats (EB) 3,032 0.59 +0.03 0 ±0 Vox (Vox) 1,614 0.31 –0.04 0 ±0 Union, Progress and Democracy (UPyD) 1,395 0.27 –0.58 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,137 0.22 +0.02 0 ±0 Social Aragonese Movement (MAS) 568 0.11 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 564 0.11 –0.05 0 ±0 Independents for Aragon (i) 511 0.10 –0.01 0 ±0 Blank ballots 4,124 0.80 –0.07 Total 513,135 7 ±0 Valid votes 513,135 99.22 –0.06 Invalid votes 4,009 0.78 +0.06 Votes cast / turnout 517,144 70.45 –2.69 Abstentions 216,920 29.55 +2.69 Registered voters 734,064 Sources

2015 + Summary of the 20 December 2015 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party–Aragonese Party (PP–PAR) 161,662 30.29 –16.62 3 –1 Spanish Socialist Workers' Party (PSOE) 118,936 22.28 –8.50 2 ±0 We Can (Podemos) 102,596 19.22 New 1 +1 Citizens–Party of the Citizenry (C's) 95,130 17.82 New 1 +1 United Left–Aragonese Union–Popular Unity in Common (IU–CHA–UPeC) 34,869 6.53 –4.93 0 –1 Union, Progress and Democracy (UPyD) 4,514 0.85 –5.57 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 4,057 0.76 +0.26 0 ±0 Blank Seats (EB) 2,967 0.56 +0.05 0 ±0 Vox (Vox) 1,849 0.35 New 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,088 0.20 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 845 0.16 –0.05 0 ±0 Independents for Aragon (i) 562 0.11 New 0 ±0 Blank ballots 4,657 0.87 –1.07 Total 533,732 7 ±0 Valid votes 533,732 99.28 +0.73 Invalid votes 3,894 0.72 –0.73 Votes cast / turnout 537,626 73.14 +1.76 Abstentions 197,453 26.86 –1.76 Registered voters 735,079 Sources

2011 + Summary of the 20 November 2011 Congress of Deputies election results in Zaragoza Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party–Aragonese Party (PP–PAR)1 241,074 46.91 +5.72 4 +1 Spanish Socialist Workers' Party (PSOE) 158,167 30.78 –15.62 2 –2 Aragonese Union–United Left: Plural Left (CHA–IU)2 58,904 11.46 +2.70 1 +1 Union, Progress and Democracy (UPyD) 32,968 6.42 +5.21 0 ±0 Equo (Equo) 3,858 0.75 New 0 ±0 Blank Seats (EB) 2,640 0.51 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 2,586 0.50 +0.33 0 ±0 Communist Party of the Peoples of Spain (PCPE) 1,055 0.21 +0.17 0 ±0 For a Fairer World (PUM+J) 939 0.18 +0.11 0 ±0 Let us Give the Change (DeC) 508 0.10 New 0 ±0 Humanist Party (PH) 463 0.09 +0.07 0 ±0 Individual Freedom Party (P–LIB) 410 0.08 New 0 ±0 Communist Unification of Spain (UCE) 370 0.07 New 0 ±0 Blank ballots 9,951 1.94 +0.68 Total 513,893 7 ±0 Valid votes 513,893 98.55 –0.96 Invalid votes 7,562 1.45 +0.96 Votes cast / turnout 521,455 71.38 –4.54 Abstentions 209,041 28.62 +4.54 Registered voters 730,496 Sources

2008