The 21st federal electoral district of Mexico City (; previously "of the Federal District") is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of the 22 currently operational districts in Mexico City.
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 fourth region.
The current member for the district, elected in the 2024 general election, is José Carlos Acosta Ruiz 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 covers 136 electoral precincts () between the borough (alcaldía) of Milpa Alta and the bulk of Xochimilco (the north-western portion of that borough is assigned to the 5th district).
The district reported a population of 436,319 in the 2020 census.
Previous districting schemes + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 Mexico City (Federal District) 27 40 30 27 24 22 Chamber of Deputies 196 300 Sources:
2017–2022 In the 2017 plan, the 21st district comprised 87 precincts in the south of Xochimilco and the whole (44 precincts) of Milpa Alta.
2005–2017 Between 2005 and 2017, the district covered the south-west of Xochimilco (85 precincts) and the whole of Milpa Alta (44 precincts). The link contains maps of the 2005 and 1996 schemes.
1996–2005 Under the 1996 scheme, the district covered the south-east of Álvaro Obregón and the west of Coyoacán. The link contains a detailed description of the 1996 district's territory.
1978–1996 The districting scheme in force from 1978 to 1996 was the result of 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 Federal District's seat allocation rose from 27 to 40. The 21st district comprised portions of the boroughs of Iztapalapa and Iztacalco. The link contains an exact description of the district's territory.
Deputies returned to Congress
+ Mexico City's 21st district Election Deputy Party Term Legislature1961Óscar Ramírez Mijares1961–196445th Congress1964Miguel Cobián Pérez1964–196746th Congress1967Óscar Ramírez Mijares1967–197047th Congress1970Héctor Ayala Guerrero1970–197348th Congress1973Mariano Araiza Zayas1973–197649th Congress1976Martha Andrade de Del Rosal 1976–197950th Congress1979Enrique Gómez Corchado1979–198251st Congress1982Everardo Gámiz Fernández1982–198552nd Congress1985Ofelia Casillas Ontiveros1985–198853rd Congress1988Víctor Sarabía Luna1988–199154th Congress1991Everardo Gámiz Fernández1991–199455th Congress1994Ofelia Casillas Ontiveros1994–199756th Congress1997Pedro Salcedo García1997–200057th Congress2000Héctor González Reza2000–200358th Congress2003Miguel Ángel Toscano2003–200659th Congress2006Alejandro Sánchez Camacho2006–200960th Congress2009Avelino Méndez Rangel2009–201261st Congress2012Alejandro Sánchez Camacho2012–201562nd Congress2015Claudia Villanueva Huerta2015–201863rd Congress2018Karen Ivette Audiffred Fernández 2018–20192019–202164th Congress2021 2021–202465th Congress2024José Carlos Acosta Ruiz 2024–202766th Congress
Presidential elections + Mexico City's 21st district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia68.74412024Claudia Sheinbaum Pardo Sigamos Haciendo Historia66.5073
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