The 4th federal electoral district of Sonora () 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 Sonora.
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 first region.
The current member for the district, elected in the 2024 general election, is Ramón ÃÂngel Flores Robles. Originally elected for the National Regeneration Movement (Morena), he switched to the Labour Party on 19 September 2024.
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, Sonora's 4th district comprises 278 electoral precincts () across 41 municipalities in the central and eastern parts of the state:
- Aconchi, Arivechi, Bacadéhuachi, Bacanora, Bacerac, Bácum, Banámichi, Baviácora, Bavispe, BenjamÃÂn Hill, Carbó, Cumpas, Divisaderos, Empalme, Granados, Guaymas, Huachinera, Huasabas, Huépac, La Colorada, Mazatán, Moctezuma, Nacori Chico, Nacozari de GarcÃÂa, Onavas, Opodepe, Rayón, Sahuaripa, San Felipe de Jesús, San Ignacio RÃÂo Muerto, San Javier, San Miguel de Horcasitas, San Pedro de la Cueva, Santa Ana, Soyopa, Suaqui Grande, Tepache, Ures, Villa Hidalgo, Villa Pesqueira and Yécora.
The head town (), where results from individual polling stations are gathered together and tallied, is the port city of Guaymas. The district reported a population of 361,610 in the 2020 Census.
Previous districting schemes
2017âÂÂ2022
Between 2017 and 2022, the district had the same configuration as at present.
2005âÂÂ2017
Under the 2005 plan, the district's head town was at Guaymas and it covered 39 municipalities.
1996âÂÂ2005
Under the 1996 districting plan, the head town was at Guaymas and the district covered 16 municipalities.
1978âÂÂ1996
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, Sonora's seat allocation rose from four to seven. The 4th district had its head town at Navojoa and it covered the municipalities of Etchojoa, Huatabampo and Navojoa.
Deputies returned to Congress
Presidential elections
Notes
References