# 4th federal electoral district of Sonora

The 4th federal electoral district of Sonora (Distrito electoral federal 04 de 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.

## District territory

Under the National Electoral Institute's 2022 districting plan, which is to be used for the 2024, 2027 and 2030 federal elections, Sonora's 4th district comprises 41 municipalities in the central and eastern parts of the state:
* Aconchi, Arivechi, Bacadéhuachi, Bacanora, Bacerac, Bácum, Banámichi, Baviácora, Bavispe, Benjamín Hill, Carbó, Cumpas, Divisaderos, Empalme, Granados, Guaymas, Huachinera, Huasabas, Huépac, La Colorada, Mazatán, Moctezuma, Nacori Chico, Nacozari de García, Onavas, Opodepe, Rayón, Sahuaripa, San Felipe de Jesús, San Ignacio Río 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 district's head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the port city of Guaymas.

## Previous districting schemes
### 2017–2022

Between 2017 and 2022, the district had the same configuration as at present.

### 2005–2017

Under the 2005 plan, the district's head town was at Guaymas and it covered 39 municipalities.

### 1996–2005

Under the 1996 districting plan, the head town was moved to Guaymas.

### 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, 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

Fourth federal electoral district of Sonora :
| Election | Deputy | Term | Legislature |
| 1979 | Rubén Duarte Corral | 1979–1982 | 51st Congress |
| 1982 | Manlio Fabio Beltrones | 1982–1985 | 52nd Congress |
| 1985 | Bulmaro Pacheco Moreno | 1985–1988 | 53rd Congress |
| 1988 | Juan Manuel Verongo Rosas | 1988–1991 | 54th Congress |
| 1991 | Arsenio Duarte Murrieta | 1991–1994 | 55th Congress |
| 1994 | Francisco Javier Hernández Armenta | 1994–1997 | 56th Congress |
| 1997 | José Ignacio Martínez Tadeo | 1997–2000 | 57th Congress |
| 2000 | Julián Luzanilla Contreras | 2000–2003 | 58th Congress |
| 2003 | Antonio Astiazarán Gutiérrez | 2003–2006 | 59th Congress |
| 2006 | Carlos Zatarain González | 2006–2009 | 60th Congress |
| 2009 | José Luis Marcos León Perea | 2009–2012 | 61st Congress |
| 2012 | Antonio Astiazarán Gutiérrez | 2012–2015 | 62nd Congress |
| 2015 | Susana Corella Platt [es] | 2015–2018 | 63rd Congress |
| 2018 | Hiriberto Aguilar Castillo | 2018–2021 | 64th Congress |
| 2021 | Hiriberto Aguilar Castillo | 2021–2024 | 65th Congress |
| 2024 | Ramón Ángel Flores Robles | 2024–2027 | 66th Congress |