# 31st federal electoral district of the State of Mexico

The 31st federal electoral district of the State of Mexico (Spanish: Distrito electoral federal 31 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 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.

## 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 31st district is located in the east of the Greater Mexico City urban area and covers a portion of one of the state's 125 municipalities:
* Nezahualcóyotl (south-eastern parts).
The district's head town (cabecera distrital), 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 :
| | 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 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.

### 1978–1996

    A portion of the municipality of Ecatepec.

## Deputies returned to Congress

Thirty-first federal electoral district of the State of Mexico :
| Election | Deputy | Term | Legislature |
| 1979 | Héctor Moreno Toscano | 1979–1982 | 51st Congress |
| 1982 | Enrique Riva Palacio Galicia [es] | 1982–1985 | 52nd Congress |
| 1985 | José Encarnación Alfaro Cázares [es] | 1985–1988 | 53rd Congress |
| 1988 | Cuauhtémoc de Anda Gutiérrez | 1988–1991 | 54th Congress |
| 1991 | Juan Adrián Ramírez García | 1991–1994 | 55th Congress |
| 1994 | Mario Enrique Vázquez Hernández | 1994–1997 | 56th Congress |
| 1997 | Antonio Cabello Sánchez | 1997–2000 | 57th Congress |
| 2000 | Rodrigo Carrillo Pérez Zeferino Antunes Flores | 2002–2003 2002–2003 | 58th Congress |
| 2003 | Héctor Miguel Bautista López | 2003–2006 | 59th Congress |
| 2006 | Juan Hugo de la Rosa García | 2006–2009 | 60th Congress |
| 2009 | Germán Osvaldo Cortez Sandoval Blanca Juana Soria Morales | 2009–2010 2010–2012 | 61st Congress |
| 2012 | Víctor Manuel Bautista López | 2012–2015 | 62nd Congress |
| 2015 | Armando Soto Espino | 2015–2018 | 63rd Congress |
| 2018 | Juan Ángel Bautista Bravo | 2018–2021 | 64th Congress |
| 2021 | Juan Ángel Bautista Bravo | 2021–2024 | 65th Congress |
| 2024 | Juan Ángel Bautista Bravo | 2024–2027 | 66th Congress |