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Cámara de Diputados (Chamber of Deputies)

Compare data for parliamentary chambers in the Electoral system module

Parliament name (generic / translated) Congreso de la Unión / Congress of the Union
Structure of parliament Bicameral
Chamber name (generic / translated) Cámara de Diputados / Chamber of Deputies
Related chamber (for bicameral parliaments) Cámara de Senadores / Senate
Electoral Law 1 January 1900
Last amendment: 03/09/1994
Mode of designation directly elected 500
Constituencies - 300 single-member constituencies
- one multi-member nationwide constituency for remaining 200 Deputies
- there is 1 Deputy for every 250,000 citizens and for every fraction over 125,000
Voting system Mixed: Mixed system:
- simple majority vote for 300 Deputies
- proportional representation (simple quotient plus greatest remainder formula) from regional party lists for remaining 200. Latter seats apportioned on basis of national vote won by each party, with proviso that majority party cannot hold more than 300 seats (or 315 with more than 60% of popular vote) overall; certain conditions to benefit from this allocation.
Vacancies arising between general elections are filled through by-elections in the absence of substitute members, except in the case of proportional representation-elected Deputies, who are replaced by the "next-in-line" candidate of the same party list.
Voting is compulsory (no sanctions).
Voter requirements - age: 18 years
- Mexican citizenship
- honest means of livelihood
- disqualifications: criminal conviction, imprisonment, fugitive from justice, sentence imposing suspension
Eligibility - qualified electors
- age: 21 years
- Mexican citizenship
- full possession of political rights
- six months' residence in constituency
Incompatibilities - religious ministers
- members of the armed forces on active duty
- police officers of commanding rank (within district)
- certain public officials (including Governors)
- judges
- connection with Federal Electoral Institute
Candidacy requirements - candidatures submitted by duly registered political parties

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