The 1st federal electoral district of Oaxaca () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of 10 such districts in the state of Oaxaca.

It elects one deputy to the lower house of Congress for each three-year legislative period 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 third region.

The current member for the district, elected in the 2024 general election, is Miriam de los Ángeles Vázquez Ruiz. Originally elected for the Labour Party (PT), on 19 September 2024 she announced she was joining 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 1st district comprises 257 precincts () across 17 of the state's municipalities in the Papaloapan region. The link provides a complete list of the municipalities covered.

The head town (), where results from individual polling stations are gathered together and tallied, is the city of San Juan Bautista Tuxtepec. The district reported a population of 435,146 in the 2020 census and, with Indigenous and Afrodescendent inhabitants accounting for over 62% of that total, it is classified by the INE as an indigenous district.

Previous districting schemes + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 Oaxaca 9 10 11 11 10 10 Chamber of Deputies 196 300Sources:

2017–2022 Oaxaca's 11th district was dissolved in the 2017 redistricting process. Under the 2017 to 2022 scheme, the 1st district had its head town at San Juan Bautista Tuxtepec and it covered 11 municipalities. The link provides a complete list of the municipalities covered.

2005–2017 In 2005–2017, the district's head town was at San Juan Bautista Tuxtepec and it comprised 11 municipalities. The link provides a complete list of the municipalities covered. The link contains comparative maps of the 2005 and 1996 schemes.

1996–2005 Between 1996 and 2017, Oaxaca's seat allocation was increased to 11. Under the 1996 districting plan, the 1st district's head town was at San Juan Bautista Tuxtepec and it comprised 10 municipalities. The link provides a complete list of the municipalities covered.

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, Oaxaca's seat allocation rose from nine to ten. The 1st district had its head town at Juchitán de Zaragoza on the Pacific coast of the Isthmus of Tehuantepec. The link provides a complete list of the municipalities covered.

Deputies returned to Congress

+ Oaxaca's 1st district Election Deputy Party Term LegislatureSalvador González Torres1916–1917Constituent Congressof Querétaro...1979 José Murat Casab 1979–198251st Congress 1982 Raúl Enríquez Palomec 1982–1985 52nd Congress 1985 Mario Bustillo Villalobos 1985–198853rd Congress 1988 José Murat Casab 1988–199154th Congress 1991 Porfirio Montero Fuentes 1991–199455th Congress 1994 Abel Trejo González 1994–1997 56th Congress 1997 Francisco Fernández Arteaga 1997–2000 57th Congress 2000 José Soto Martínez 2000–2003 58th Congress 2003 Eviel Pérez MagañaGustavo Zanatta Gasperín2003–20042004–2006 59th Congress 2006 Daniel Dehesa Mora 2006–2009 60th Congress 2009 Eviel Pérez MagañaVioleta Avilés Álvarez2009–2012 61st Congress 2012 José Soto Martínez2012–2015 62nd Congress 2015 Antonio Amaro Cancino 2015–2018 63rd Congress 2018Irineo Molina Espinoza 2018–2021 64th Congress 2021Ángel Domínguez Escobar 2021–2024 65th Congress 2024 Miriam de los Ángeles Vázquez Ruiz 2024–202766th Congress

Presidential elections + Oaxaca's 1st district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 61.65872024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 77.3132

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