The 4th federal electoral district of San Luis Potosí () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of seven such districts in the state of San Luis Potosí.
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 second region.
The current member for the district, elected in the 2024 general election, is Francisco Adrián Castillo Morales 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 4th district shares the eastern portion of the state with the 7th district. It covers 333 electoral precincts () across 12 of the state's municipalities: Alaquines, Cárdenas, Ciudad del Maíz, Ciudad Valles, Ébano, Rayón, San Vicente Tancuayalab, Santa Catarina, Tamasopo, Tamuín, Tanquián de Escobedo and El Naranjo.
The district's head town (), where results from individual polling stations are gathered together and tallied, is at Ciudad Valles. The district reported a population of 419,880 in the 2020 census.
Previous districting schemes + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 San Luis Potosí 5 7 7 7 7 7 Chamber of Deputies 196 300 Sources:
2017–2022 Between 2017 and 2022, the district was further east within the state. It covered seven municipalities: Ciudad Valles, Ébano, San Vicente Tancuayalab, Tamasopo, Tamuín, Tanquián de Escobedo and El Naranjo. The head town was at Ciudad Valles.
2005–2017 Under the 2005 districting plan, the district had its head town at Ciudad Valles and it covered eight municipalities: Ciudad Valles, Ébano, El Naranjo, San Vicente Tancuayalab, Santa Catarina, Tamasopo, Tamuin and Tanquián de Escobedo. The link contains comparative maps of the 1996 and 2005 schemes.
1996–2005 From 1996 to 2005, the district had its head town at Ciudad Valles and it covered nine municipalities: the same eight as in the 2005 scheme, plus Tanlajás.
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, San Luis Potosí's seat allocation rose from five to seven. The fourth district's head town was at Ciudad del Maíz and it covered the municipalities of Alaquines, Aquismón, Armadillo de los Infante, Cárdenas, Cerritos, Cerro de San Pedro, Ciudad del Maíz, Guadalcázar, Lagunillas, Rayón, San Ciro de Acosta, Santa Catarina, Tamasopo and Villa Juárez.
Deputies returned to Congress
+ San Luis Potosí's 4th district Election Deputy Party Term LegislatureCosme Dávila1916–1917Constituent Congressof Querétaro ...1967Guillermo Fonseca ÁlvarezFausto Zapata Loredo19671967–197047th Congress1970Luis Tudón Hurtado1970–19731973Vicente Ruiz Chiapeto1973–19761976Héctor González Lárraga1976–197950th Congress1979Ángel Martínez Manzanares1979–198251st Congress1982Gerardo Ramos Romo1982–198552nd Congress1985Rosa María Armendáriz Muñoz1985–198853rd Congress1988Miguel de J. Martínez Castro1988–199154th Congress1991Jesús Mario del Valle Fernández1991–199455th Congress1994Antonio Rivera Barrón1994–199756th Congress1997Antonio Esper Bujaidar1997–200057th Congress2000José Manuel Medellín Milán2000–200358th Congress2003José María de la Vega Lárraga2003–200659th Congress2006David Lara Compeán2006–200960th Congress2009Delia Guerrero Coronado2009–201261st Congress2012Jorge Terán Juárez2012–201562nd Congress2015Cándido Ochoa Rojas2015–201863rd Congress2018José Ricardo Delsol Estrada2018–202164th Congress2021Antolín Guerrero Márquez 2021–202465th Congress2024Francisco Adrián Castillo Morales 2024–202766th Congress
Presidential elections + San Luis Potosí's 4th district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 54.00192024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 66.2728
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