# 20th federal electoral district of the State of Mexico

The 20th federal electoral district of the State of Mexico (Spanish: Distrito electoral federal 20 del Estado de México) 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.

## District territory

Under the National Electoral Institute's 2022 districting plan, which is to be used for the 2024, 2027 and 2030 federal elections, the 20th district covers four of the state's 125 municipalities:
* Jaltenco, Nextlalpan, Tonanitla and the southern portion of Tecámac.
The district's head town (cabecera distrital), 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 :
| | 1972 | 1978 | 1996 | 2005 | 2017 | 2022 |
| State of Mexico | 15 | 34 | 36 | 40 | 41 | 40 |
| Chamber of Deputies | 196 | 300 | 300 | 300 | 300 | 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.

### 1978–1996

    A portion of Naucalpan de Juárez.

## Deputies returned to Congress

Twentieth federal electoral district of the State of Mexico :
| Election | Deputy | Term | Legislature |
| 1979 | José Antonio Rivas Roa | 1979–1982 | 51st Congress |
| 1982 | José Ruiz González | 1982–1985 | 52nd Congress |
| 1985 | Serafín Roa Cortés | 1985–1988 | 53rd Congress |
| 1988 | Mario Galicía Vargas | 1988–1991 | 54th Congress |
| 1991 | Roberto Soto Prieto | 1991–1994 | 55th Congress |
| 1994 | Roberto Flores González | 1994–1997 | 56th Congress |
| 1997 | José Luis Sánchez Campos | 1997–2000 | 57th Congress |
| 2000 | Lionel Funes Díaz | 2000–2003 | 58th Congress |
| 2003 | José Luis Naranjo y Quintana | 2003–2006 | 59th Congress |
| 2006 | Martín Zepeda Hernández | 2006–2009 | 60th Congress |
| 2009 | Jesús Ricardo Enríquez Fuentes Martha Patricia Bernal Díaz | 2009–2012 2012 | 61st Congress |
| 2012 | Joaquina Navarrete Contreras | 2012–2015 | 62nd Congress |
| 2015 | José Santiago López | 2015–2018 | 63rd Congress |
| 2018 | Juan Pablo Sánchez Rodríguez | 2018–2021 | 64th Congress |
| 2021 | Juan Pablo Sánchez Rodríguez | 2021–2024 | 65th Congress |
| 2024 | Montserrat Ruiz Paez | 2024–2027 | 66th Congress |