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.^[1]

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.^[2][3]

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.^[4] The new districts were first contended in the 1979 mid-term election.

Under the National Electoral Institute's 2022 districting plan, which is to be used for the 2024, 2027 and 2030 federal elections,^[5] 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).^[6][7][a]

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.^[1][8]

1978–1996

A portion of Ecatepec.^[9]

National parties
Current
	PAN
	PRI
	PT
	PVEM
	MC
	Morena
Defunct or local only
	PLM
	PNR
	PRM
	PP
	PPS
	PARM
	PFCRN
	Convergencia
	PANAL
	PSD
	PES
	PRD

Thirty-first federal electoral district of the State of Mexico

Election	Deputy	Party	Term	Legislature
1979	Héctor Moreno Toscano[10]		1979–1982	51st Congress
1982	Enrique Riva Palacio Galicia [es][11]		1982–1985	52nd Congress
1985	José Encarnación Alfaro Cázares [es][12]		1985–1988	53rd Congress
1988	Cuauhtémoc de Anda Gutiérrez[13]		1988–1991	54th Congress
1991	Juan Adrián Ramírez García[14]		1991–1994	55th Congress
1994	Mario Enrique Vázquez Hernández[15]		1994–1997	56th Congress
1997	Antonio Cabello Sánchez[16]		1997–2000	57th Congress
2000	Rodrigo Carrillo Pérez[17][b] Zeferino Antunes Flores[18]		2002–2003 2002–2003	58th Congress
2003	Héctor Miguel Bautista López[19]		2003–2006	59th Congress
2006	Juan Hugo de la Rosa García[20]		2006–2009	60th Congress
2009	Germán Osvaldo Cortez Sandoval[21][c] Blanca Juana Soria Morales[22]		2009–2010 2010–2012	61st Congress
2012	Víctor Manuel Bautista López[23]		2012–2015	62nd Congress
2015	Armando Soto Espino[24]		2015–2018	63rd Congress
2018	Juan Ángel Bautista Bravo[25]		2018–2021	64th Congress
2021	Juan Ángel Bautista Bravo[26]		2021–2024	65th Congress
2024[27]	Juan Ángel Bautista Bravo[28]		2024–2027	66th Congress

19°24′N 99°01′W / 19.400°N 99.017°W / 19.400; -99.017