Cádiz 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 nine 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 1 4 2 1st 1979 1 2 3 2 2nd 1982 6 2 3rd 1986 7 2 4th 1989 1 1 6 1 5th 1993 1 5 3 6th 1996 1 4 4 7th 2000 1 4 4 8th 2004 6 3 9th 2008 5 4 10th 2011 3 5 11th 2015 2 3 1 3 12th 2016 2 3 1 3 13th 2019 (Apr) 2 3 2 1 1 14th 2019 (Nov) 1 3 1 2 2 15th 2023 1 3 4 1

General elections 2023 + Summary of the 23 July 2023 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party (PP) 221,703 34.80 +16.77 4 +2 Spanish Socialist Workers' Party (PSOE) 211,200 33.15 +2.59 3 ±0 Vox (Vox) 96,720 15.18 –6.12 1 –1 Unite Andalusia (Sumar)1 82,115 12.89 –4.13 1 ±0 Forward Andalusia (Adelante Andalucía) 9,191 1.44 New 0 ±0 Animalist Party with the Environment (PACMA)2 5,937 0.93 –0.44 0 ±0 Workers' Front (FO) 1,225 0.19 New 0 ±0 Walking Together (CJ) 745 0.12 New 0 ±0 For a Fairer World (PUM+J) 673 0.11 ±0.00 0 ±0 Zero Cuts (Recortes Cero) 486 0.08 –0.07 0 ±0 Citizens–Party of the Citizenry (Cs) n/a n/a –9.01 0 –1 Blank ballots 7,103 1.11 –0.39 Total 637,098 9 ±0 Valid votes 637,098 98.81 +0.11 Invalid votes 7,703 1.19 –0.11 Votes cast / turnout 644,801 63.34 +1.06 Abstentions 373,157 36.66 –1.06 Registered voters 1,017,958 Sources

November 2019 + Summary of the 10 November 2019 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 188,271 30.56 –0.92 3 ±0 Vox (Vox) 131,205 21.30 +8.20 2 +1 People's Party (PP) 111,089 18.03 +3.14 2 +1 United We Can (Podemos–IULV–CA) 93,541 15.18 –1.42 1 –1 Citizens–Party of the Citizenry (Cs) 55,490 9.01 –10.70 1 –1 More Country–Andalusia (Más País–Andalucía) 11,316 1.84 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 8,437 1.37 –0.29 0 ±0 Andalusia by Herself (AxSí) 3,509 0.57 –0.07 0 ±0 Spanish Communist Workers' Party (PCOE) 1,739 0.28 –0.05 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 915 0.15 –0.09 0 ±0 For a Fairer World (PUM+J) 707 0.11 New 0 ±0 Communist Party of the Andalusian People (PCPA) 639 0.10 –0.02 0 ±0 Blank ballots 9,221 1.50 +0.27 Total 616,079 9 ±0 Valid votes 616,079 98.70 –0.06 Invalid votes 8,116 1.30 +0.06 Votes cast / turnout 624,195 62.28 –5.31 Abstentions 378,100 37.72 +5.31 Registered voters 1,002,295 Sources

April 2019 + Summary of the 28 April 2019 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 210,131 31.48 +2.98 3 ±0 Citizens–Party of the Citizenry (Cs) 131,567 19.71 +5.41 2 +1 United We Can (Podemos–IULV–CA–Equo) 110,807 16.60 –4.62 2 ±0 People's Party (PP) 99,394 14.89 –17.41 1 –2 Vox (Vox) 87,438 13.10 +12.90 1 +1 Animalist Party Against Mistreatment of Animals (PACMA) 11,079 1.66 +0.08 0 ±0 Andalusia by Herself (AxSí) 4,284 0.64 New 0 ±0 Spanish Communist Workers' Party (PCOE) 2,224 0.33 New 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,620 0.24 +0.01 0 ±0 Communist Party of the Andalusian People (PCPA) 812 0.12 ±0.00 0 ±0 Blank ballots 8,206 1.23 +0.10 Total 667,562 9 ±0 Valid votes 667,562 98.76 –0.20 Invalid votes 8,350 1.24 +0.20 Votes cast / turnout 675,912 67.59 +4.97 Abstentions 324,125 32.41 –4.97 Registered voters 1,000,037 Sources

2016 + Summary of the 26 June 2016 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party (PP) 198,876 32.30 +4.56 3 ±0 Spanish Socialist Workers' Party (PSOE) 175,498 28.50 +0.52 3 ±0 United We Can for Andalusia (Podemos–IU–Equo)1 130,643 21.22 –5.01 2 ±0 Citizens–Party of the Citizenry (C's) 88,029 14.30 –0.39 1 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 9,719 1.58 +0.41 0 ±0 Union, Progress and Democracy (UPyD) 1,750 0.28 –0.28 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,417 0.23 +0.07 0 ±0 Vox (Vox) 1,253 0.20 –0.03 0 ±0 Communist Party of the Peoples of Spain (PCPE) 767 0.12 ±0.00 0 ±0 Spanish Phalanx of the CNSO (FE de las JONS) 472 0.08 New 0 ±0 Libertarian Party (P–LIB) 393 0.06 –0.01 0 ±0 Blank ballots 6,938 1.13 +0.08 Total 615,755 9 ±0 Valid votes 615,755 98.96 –0.14 Invalid votes 6,497 1.04 +0.14 Votes cast / turnout 622,252 62.62 –3.04 Abstentions 371,437 37.38 +3.04 Registered voters 993,689 Sources

2015 + Summary of the 20 December 2015 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 180,895 27.98 –4.79 3 ±0 People's Party (PP) 179,319 27.74 –19.32 3 –2 We Can (Podemos) 130,734 20.22 New 2 +2 Citizens–Party of the Citizenry (C's) 94,962 14.69 New 1 +1 United Left/Greens–Assembly for Andalusia–Popular Unity (IULV–CA–UPeC) 38,881 6.01 –2.74 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 7,591 1.17 +0.71 0 ±0 Union, Progress and Democracy (UPyD) 3,637 0.56 –4.24 0 ±0 Vox (Vox) 1,493 0.23 New 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 1,042 0.16 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 780 0.12 –0.05 0 ±0 Libertarian Party (P–LIB) 422 0.07 New 0 ±0 Blank ballots 6,781 1.05 –0.32 Total 646,537 9 +1 Valid votes 646,537 99.10 –0.01 Invalid votes 5,863 0.90 +0.01 Votes cast / turnout 652,400 65.66 +1.87 Abstentions 341,218 34.34 –1.87 Registered voters 993,618 Sources

2011 + Summary of the 20 November 2011 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Party (PP) 291,897 47.06 +8.85 5 +1 Spanish Socialist Workers' Party (PSOE) 203,251 32.77 –18.34 3 –2 United Left/The Greens–Assembly for Andalusia: Plural Left (IULV–CA) 54,262 8.75 +3.94 0 ±0 Union, Progress and Democracy (UPyD) 29,761 4.80 +3.93 0 ±0 Andalusian Party (PA)1 19,289 3.11 +0.61 0 ±0 Equo (Equo) 4,345 0.70 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 2,872 0.46 +0.22 0 ±0 Blank Seats (EB) 2,329 0.38 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 1,072 0.17 +0.05 0 ±0 Hartos.org (Hartos.org) 921 0.15 New 0 ±0 Anti-capitalists (Anticapitalistas) 874 0.14 New 0 ±0 Internet Party (Internet) 603 0.10 New 0 ±0 Communist Unification of Spain (UCE) 265 0.04 New 0 ±0 Blank ballots 8,511 1.37 +0.34 Total 620,252 8 –1 Valid votes 620,252 99.11 –0.25 Invalid votes 5,539 0.89 +0.25 Votes cast / turnout 625,791 63.79 –3.65 Abstentions 355,270 36.21 +3.65 Registered voters 981,061 Sources

2008 + Summary of the 9 March 2008 Congress of Deputies election results in Cádiz Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 328,822 51.11 +0.44 5 –1 People's Party (PP) 245,830 38.21 +4.59 4 +1 United Left/The Greens–Assembly for Andalusia–Alternative (IULV–CA) 30,958 4.81 –1.19 0 ±0 Andalusian Coalition (CA)1 16,058 2.50 –4.27 0 ±0 Union, Progress and Democracy (UPyD) 5,572 0.87 New 0 ±0 The Greens (Verdes) 2,531 0.39 New 0 ±0 Anti-Bullfighting Party Against Mistreatment of Animals (PACMA) 1,547 0.24 New 0 ±0 Social Democratic Party (PSD) 1,085 0.17 New 0 ±0 Communist Party of the Peoples of Spain (PCPE) 795 0.12 +0.12 0 ±0 For a Fairer World (PUM+J) 629 0.10 New 0 ±0 Citizens–Party of the Citizenry (C's) 558 0.09 New 0 ±0 Humanist Party (PH) 389 0.06 –0.05 0 ±0 Family and Life Party (PFyV) 374 0.06 New 0 ±0 National Democracy (DN) 368 0.06 –0.01 0 ±0 Spanish Alternative (AES) 343 0.05 New 0 ±0 Christian Positivist Party (PPCr) 300 0.05 –0.03 0 ±0 Spanish Phalanx of the CNSO (FE de las JONS) 291 0.05 –0.03 0 ±0 Authentic Phalanx (FA) 219 0.03 New 0 ±0 Blank ballots 6,639 1.03 –0.78 Total 643,308 9 ±0 Valid votes 643,308 99.36 +0.07 Invalid votes 4,140 0.64 –0.07 Votes cast / turnout 647,448 67.44 –2.47 Abstentions 312,585 32.56 +2.47 Registered voters 960,033 Sources

2004