The 3rd federal electoral district of Tamaulipas () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of eight such districts in the state of Tamaulipas.
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 Casandra Prisilla de los Santos Flores. Originally elected for the National Regeneration Movement (Morena), she switched to the Ecologist Green Party of Mexico (PVEM) at the start of the congressional session.
District territory Tamaulipas lost a district in 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 reconfigured 3rd district covers 211 electoral precincts () across 15 of the state's 43 municipalities: Abasolo, Burgos, Cruillas, Jiménez, Mainero, Méndez, Padilla, Río Bravo, San Carlos, San Fernando, San Nicolás, Soto la Marina, Valle Hermoso and Villagrán, plus the portion of Matamoros not covered by the 4th district.
The head town (), where results from individual polling stations are gathered together and tallied, is the city of Río Bravo. The district reported a population of 426,145 in the 2020 census.
Previous districting schemes + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 Tamaulipas 6 9 8 8 9 8 Chamber of Deputies 196 300Sources:
2017–2022 Between 2017 and 2022, Tamaulipas accounted for nine single-member congressional seats. The 3rd district's head town was at Río Bravo and it covered seven municipalities: Burgos, Cruillas, Matamoros (part), Méndez, Río Bravo, San Fernando and Valle Hermoso.
2005–2017 Under the 2005 plan, Tamaulipas had eight districts. This district's head town was at Río Bravo and it covered: The link contains maps of the 2005 and 1996 schemes. The municipalities of Burgos, Cruillas, Gustavo Díaz Ordaz, Méndez, Río Bravo, San Fernando and Valle Hermoso in their entirety, plus the southern portions of Matamoros and Reynosa.
1996–2005 In the 1996 scheme, under which Tamaulipas lost a single-member seat, the district had its head town at San Fernando and it comprised 12 municipalities: Abasolo, Burgos, Cruillas, Jiménez, Méndez, Padilla, Río Bravo, San Carlos, San Fernando, San Nicolás, Soto la Marina and Valle Hermoso.
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, Tamaulipas's seat allocation rose from six to nine. The 3rd district's head town was at Matamoros and it covered that city and its surrounding municipality.
Deputies returned to Congress
+ Tamaulipas's 3rd district Election Deputy Party Term Legislature1916–1917Constituent Congressof Querétaro ...1924Emilio Portes Gil1924–192631st Congress ...1976Agapito González Cavazos1976–197950th Congress1979Miguel Treviño Emparán1979–198251st Congress1982Heriberto Batres García1982–198552nd Congress19851985–198853rd Congress1988Miguel Treviño Emparán1988–199154th Congress1991Tomás Yarrington Ruvalcaba1991–199455th Congress1994Homar Zamorano Ayala1994–199756th Congress1997Rosalinda Banda Gómez1997–200057th Congress2000Librado Treviño Gutiérrez2000–200358th Congress2003Jesús Humberto Martínez de la Cruz2003–200659th Congress2006Omeheira López Reyna2006–200960th Congress2009Edgardo Melhem Salinas2009–201261st Congress2012José Alejandro Llanas Alba2012–201562nd Congress2015Edgardo Melhem Salinas2015–201863rd Congress2018Héctor Joel Villegas González2018–202164th Congress2021Tomás Gloria Requena2021–202465th Congress2024Casandra Prisilla de los Santos Flores 2024–202766th Congress
Presidential elections + Tamaulipas's 3rd district Election District won by Party or coalition % 2018Andrés Manuel López Obrador Juntos Haremos Historia 46.47392024Claudia Sheinbaum Pardo Sigamos Haciendo Historia 61.6378
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