Congress of the Union

Congress of the Union
Congreso de la Unión
LXIV Legislature
Houses Senate
Chamber of Deputies
Founded September 28, 1821 (1821-09-28)
Seats 628
(500 Deputies)
(128 Senators)
Senate political groups

Government (70)

  •      MRN (55)
  •      PT (6)
  •      PES (8)

Opposition (58)

  •      PAN (23)
  •      PRI (13)
  •      PRD (8)
  •      MC (7)
  •      PVEM (7)
  •      PNA (1)
Chamber of Deputies political groups

Government (312)

  •      MRN (189)
  •      PT (61)
  •      PES (56)

Opposition (188)

  •      PAN (83)
  •      PRI (45)
  •      MC (27)
  •      PRD (21)
  •      PVEM (16)
  •      PNA (2)
Authority Title III, Chapter II of the
Political Constitution of
the United Mexican States
Salary $500,000 pesos (Senator)[1][2]
$150,139 pesos (Deputy)[3][4]
Senate last election
July 1, 2018 (2018-07-01)
Chamber of Deputies last election
July 1, 2018 (2018-07-01)
La Patria Es Primero
(The Country Is First)
Meeting place
Palacio del Senado
Mexico City
Palacio Legislativo de San Lázaro
Mexico City
Senate Website
Chamber of Deputies Website
Mexican Constitution of 1917

The Congress of the Union (Spanish: Congreso de la Unión), formally known as the General Congress of the United Mexican States (Congreso General de los Estados Unidos Mexicanos), is the bicameral legislature of the federal government of Mexico consisting of two chambers: the Senate of the Republic and the Chamber of Deputies.

The Congress of the Union meets in Mexico City and consists of 628 members: 500 deputies and 128 senators.


The Congress is a bicameral body, consisting of two chambers: Senate of the Republic and the Chamber of Deputies. Its structure and responsibilities are defined in the Third Title, Second Chapter, Articles 50 to 79 of the 1917 Constitution. The upper chamber is the Senate, "Cámara de Senadores" or "Senado". It comprises 128 seats, 96 members are elected by direct popular vote for six-year terms; the other 32 seats are allocated based on proportional representation. The lower house is the Chamber of Deputies, or "Cámara de Diputados". It has 500 seats; 300 members are elected by popular vote to three-year terms, and the other 200 seats are allocated according to proportional representation.


The Congress of the Union (Congreso de la Unión) has two chambers. The Chamber of Deputies (Cámara de Diputados) has 500 members, each elected for a three-year term, 300 of whom are elected in single-seat constituencies by plurality, with the remaining 200 members elected by proportional representation in 5 multi-state, 40-seat constituencies.[5] The 200 PR-seats are distributed generally without taking account the 300 plurality-seats (parallel voting), but since 1996 a party cannot get more seats overall than 8% above its result for the PR-seats (a party must win 42% of the votes for the PR-seats to achieve an overall majority).

There are two exceptions to that rule. A party can lose only PR-seats by that rule (not plurality-seats). Also, a party cannot get more than 300 seats overall (even if it has more than 52% of the votes for the PR-seats).

The Chamber of Senators (Cámara de Senadores) has 128 members, elected for a six-year term, 96 of them in three-seat constituencies (corresponding to the nation's 31 states and one Federal District) and 32 by proportional representation on a nationwide basis.[6] In the state constituencies, two seats are awarded to the plurality winner and one to the first runner-up.

Permanent Committee

The "Comisión Permanente del Congreso de la Unión", translated variously as the Permanent Committee or Standing Committee, is a body of 19 deputies and 18 senators that is responsible for tasks relating to the Congress when it is in recess.


It is conventional to refer to each Legislature by the Roman numeral of its term. Thus, the current Congress (whose term lasts from 2018 to 2021) is known as the "LXIV Legislature"; the previous Congress (whose term lasted from 2015 to 2018) was the "LXIII Legislature", and so forth. The I Legislature of Congress was the first Constitutional congress after the 1857 Constitution.

Early in the 20th century, the revolutionary leader Francisco I. Madero popularized the slogan Sufragio Efectivo – no Reelección ("Effective suffrage, no reelection"). In keeping with that long-held principle, and until 2014, the 1917 Constitution stated that "Deputies and Senators could not be reelected for the next immediate term".[7]


On February 10, 2014, the Mexican Constitution was amended to allow reelection to the legislative bodies for the first time. Starting with the General ELection of 2018, Deputies and Senators are allowed to run for reelection.[8] Members of the Chamber of Deputies may serve up to four terms of three years each while members of the Senate may serve two terms of six years each; in total, members of both houses will be allowed to remain in office for a total of 12 years.[9]

Last election


Party Constituency Proportional Seats before Seats won +/–
Votes % Seats Votes % Seats
National Regeneration Movement||16,558,78137.534414058 58
National Action Party||7,815,24717.711663422 12
Institutional Revolutionary Party||6,965,76515.79865514 41
Party of the Democratic Revolution||2,368,8425.377279 2
Citizens' Movement||2,010,3364.555207 7
Ecologist Green Party||1,951,5194.424155 0
Labor Party||1,674,1913.7961197 12
Social Encounter Party||1,038,3252.355005 5
New Alliance Party||1,037,6762.351001 1
||style=text-align:left;|Independents844,7341.91080 8
||style=text-align:left;|Invalid/blank votes1,811,1804.10
||style=text-align:left;|Registered voters/turnout89,994,03963.3789,994,039
Source: INE (reporting: 92.22%)

Chamber of Deputies

Party District Proportional Seats Before Seats Won +/–
Votes % Seats Votes % Seats
National Regeneration Movement16,279,807 37.24 10984 47193 146
National Action Party7,897,600 18.06 3841 10779 28
Institutional Revolutionary Party7,161,370 16.38 636 20442 162
Party of the Democratic Revolution2,338,835 5.35 1112 5323 30
Ecologist Green Party|| 2,072,9834.74 710 3817 21
Citizens' Movement1,914,883 4.38 1610 2126 5
Labor Party1,701,981 3.89 547 661 55
New Alliance Party1,106,428 2.53 10 121 11
Social Encounter Party1,056,918 2.41 580 1258 46
||style=text-align:left;|Independents403,108 0.92 00 60 6
||style=text-align:left;|Write-ins49,029 0.11
||style=text-align:left;|Invalid/blank votes1,732,645 3.96
Total43,715,587 100300100200 5005000
||style=text-align:left;|Registered voters/turnout89,994,03963.189,994,039

See also


  1. "Manual de Percepciones de los Senadores..." (PDF). Senado de la República. p. 5. Retrieved 19 August 2011.
  2. "2 Mil 312 Millones Para Sueldos de Senadores y Diputados en 2010". El Siglo de Torreón. Archived from the original on 29 June 2012. Retrieved 19 August 2011.
  3. "Poder Legislativo" (PDF). Cámara de Diputados. Archived from the original (PDF) on 3 December 2011. Retrieved 19 August 2011.
  4. "Consejeros del InfoDF ganan más que Ebrard". La Razón. Retrieved 19 August 2018.
  5. "Archived copy". Archived from the original on 2011-08-23. Retrieved 2011-08-29.
  6. "Archived copy". Archived from the original on 2011-08-23. Retrieved 2011-08-29.
  7. Constitution of 1917, article 50, 59.
  8. "Constitución Política de los Estados Unidos Mexicanos. Artículo 59". Instituto de Investigaciones Jurídicas de la UNAM (in Spanish). Archived from the original on 14 October 2003. Retrieved 2 April 2015.
  9. Becerra, Bertha (20 May 2014). "Habría reelección de diputados y senadores a partir del 2018". La Prensa (in Spanish). Organización Editorial Mexicana. Retrieved 1 April 2015.
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