The 21st 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 21st 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 Iván Millán Contreras 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 21st district is located in the state's eastern panhandle and covers 174 electoral precincts () across 12 of its 125 municipalities: Amecameca, Atlautla, Ayapango, Cocotitlán, Ecatzingo, Juchitepec, Ozumba, Temamatla, Tenango del Aire, Tepetlixpa, Tlalmanalco and the eastern portion of Ixtapaluca.
The head town (), where results from individual polling stations are gathered together and tallied, is the city of Amecameca de Juárez. In the 2020 census, the district reported a total population of 410,835.
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 21st district was situated as follows:
2017–2022 Ten municipalities in the eastern panhandle: Amecameca, Atlautla, Ayapango, Ecatzingo, Juchitepec, Ozumba, Tenango del Aire, Tepetlixpa, Tlamanalco and the eastern portion of Ixtapaluca. The head town was at Amecameca de Juárez.
2005–2017 A portion of the municipality of Naucalpan de Juárez.
1996–2005 The northern, north-eastern and western parts of Naucalpan de Juárez. The link contains comparative maps of the 1996 and 2005 schemes.
1978–1996 The municipalities of Acolman, Apaxco, Axapusco, Hueypoxtla, Jaltenco, Melchor Ocampo, Nextlalpan, Nopaltepec, San Martín de las Pirámides, Tecámac, Temascalapa, Teoloyucan, Teotihuacán, Tequixquiac, Tezoyuca, Tultepec and Zumpango, with its head town at Zumpango de Ocampo.
Deputies returned to Congress
+ State of Mexico's 21st district Election Deputy Party Term Legislature1979Alfredo Navarrete Romero1979–198251st Congress1982Hugo Díaz Thomé1982–198552nd Congress1985Pedro Zamora Ortiz1985–198853rd Congress1988Cecilio Barrera Reyes1988–199154th Congress1991Javier Barrios González1991–199455th Congress1994Leonel Domínguez Rivero1994–199756th Congress1997Héctor Flavio Valdez García1997–200057th Congress2000Moisés Alcalde Virgen2000–200358th Congress2003Manuel Gómez Morín Martínez del Río 2003–200659th Congress2006Edgar Olvera HigueraMaría Eugenia Patiño Sánchez 2006–2009200960th Congress2009Rodrigo Reina Liceaga2009–201261st Congress2012Cristina Ruiz Sandoval2012–201562nd Congress2015Luis Gilberto Marrón AgustínJaime Mauricio Rojas Silva2015–2018201863rd Congress2018Graciela Sánchez Ortiz 2018–202164th Congress2021Graciela Sánchez Ortiz 2021–202465th Congress2024Iván Millán Contreras2024–202766th Congress
Presidential elections + State of Mexico's 21st district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 60.59502024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 68.1013
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