The 20th 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 20th 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, elected in the 2024 general election, is Montserrat Ruiz Paez 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 20th district covers 158 electoral precincts () across four of the state's 125 municipalities: Jaltenco, Nextlalpan, Tonanitla and the southern portion of Tecámac.
The head town (), where results from individual polling stations are gathered together and tallied, is the city of Ojo de Agua, Tecámac. In the 2020 census, the district reported a total population of 383,060.
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 20th district was situated as follows:
2017–2022 The northern portion of the municipality of Nezahualcóyotl.
2005–2017 The northern portion of the municipality of Nezahualcóyotl, slightly smaller than under the 2022 plan.
1996–2005 The northern portion of the municipality of Nezahualcóyotl, slightly smaller than under the 2005 plan. The link contains comparative maps of the 1996 and 2005 schemes.
1978–1996 A portion of Naucalpan de Juárez.
Deputies returned to Congress
+ State of Mexico's 20th district Election Deputy Party Term Legislature1979José Antonio Rivas Roa1979–198251st Congress1982José Ruiz González1982–198552nd Congress1985Serafín Roa Cortés1985–198853rd Congress1988Mario Galicía Vargas1988–199154th Congress1991Roberto Soto Prieto1991–199455th Congress1994Roberto Flores González1994–199756th Congress1997José Luis Sánchez Campos1997–200057th Congress2000Lionel Funes Díaz2000–200358th Congress2003José Luis Naranjo y Quintana2003–200659th Congress2006Martín Zepeda Hernández2006–200960th Congress2009Jesús Ricardo Enríquez FuentesMartha Patricia Bernal Díaz2009–2012201261st Congress2012Joaquina Navarrete Contreras2012–201562nd Congress2015José Santiago López2015–201863rd Congress2018Juan Pablo Sánchez Rodríguez 2018–202164th Congress2021Juan Pablo Sánchez Rodríguez 2021–202465th Congress2024Montserrat Ruiz Paez 2024–202766th Congress
Presidential elections + State of Mexico's 20th district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 59.04762024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 60.7677
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