The 31st federal electoral district of the State of Mexico () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of 40 such districts in the State of Mexico.
It elects one deputy to the lower house of Congress for each three-year legislative session by means of the first-past-the-post system. Votes cast in the district also count towards the calculation of proportional representation ("plurinominal") deputies elected from the fifth region.
The 31st district was created by the 1977 electoral reforms, which increased the number of single-member seats in the Chamber of Deputies from 196 to 300. Under that plan, the State of Mexico's seat allocation rose from 15 to 34. The new districts were first contended in the 1979 mid-term election.
The current member for the district, re-elected in the 2024 general election, is Juan Ángel Bautista Bravo of the National Regeneration Movement (Morena).
District territory Under the 2023 districting plan adopted by the National Electoral Institute (INE), which is to be used for the 2024, 2027 and 2030 federal elections, the 31st district is located in the east of the Greater Mexico City urban area and covers 274 electoral precincts () across a portion of one of the state's 125 municipalities: Nezahualcóyotl (south-eastern parts).
The head town (), where results from individual polling stations are gathered together and tallied, is Ciudad Nezahualcóyotl. In the 2020 census, the district reported a total population of 437,480.
Previous districting schemes + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 State of Mexico15 34 36 40 41 40 Chamber of Deputies 196 300 Sources:
Under the previous districting plans enacted by the INE and its predecessors, the 31st district was situated as follows:
2017–2022 South-eastern parts of the municipality of Nezahualcóyotl.
2005–2017 South-eastern parts of Nezahualcóyotl.
1996–2005 South-eastern parts of Nezahualcóyotl. The link contains comparative maps of the 1996 and 2005 schemes.
1978–1996 A portion of the municipality of Ecatepec.
Deputies returned to Congress
+ State of Mexico's 30th district Election Deputy Party Term Legislature1979Héctor Moreno Toscano1979–198251st Congress19821982–198552nd Congress19851985–198853rd Congress1988Cuauhtémoc de Anda Gutiérrez1988–199154th Congress1991Juan Adrián Ramírez García1991–199455th Congress1994Mario Enrique Vázquez Hernández1994–199756th Congress1997Antonio Cabello Sánchez1997–200057th Congress2000Rodrigo Carrillo PérezZeferino Antunes Flores 2002–20032002–200358th Congress2003Héctor Miguel Bautista López2003–200659th Congress2006Juan Hugo de la Rosa García2006–200960th Congress2009Germán Osvaldo Cortez SandovalBlanca Juana Soria Morales2009–20102010–201261st Congress2012Víctor Manuel Bautista López2012–201562nd Congress2015Armando Soto Espino2015–201863rd Congress2018Juan Ángel Bautista Bravo 2018–202164th Congress2021Juan Ángel Bautista Bravo 2021–202465th Congress2024Juan Ángel Bautista Bravo 2024–202766th Congress
Presidential elections + State of Mexico's 31st district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 59.52112024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 65.8135
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