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.[2][3]
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,[9] Jalisco's 18th district covers the south-west of the state, along the Pacific Ocean coast and the border with Colima, and comprises 261 electoral precincts (secciones electorales) across 25 of the state's 125 municipalities:[10]
The head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the city of Autlán de Navarro. The district reported a population of 412,437 in the 2020 Census.[1]
Jalisco regained its 20th congressional seat in the 2017 redistricting process. The 18th district's head town was at Autlán and it covered 22 municipalities:[14][13]
Ameca, Atengo, Autlán de Navarro, Ayutla, Casimiro Castillo, Cihuatlán, Cuautitlán de García Barragán, Cuautla, Chiquilistlán, Ejutla, El Grullo, El Limón, Juchitlán, La Huerta, Tecolotlán, Tenamaxtlán, Tolimán, Tonaya, Tuxcacuesco, Unión de Tula, Villa Purificación and Zapotitlán de Vadillo.
2005–2017
Under the 2005 plan, Jalisco had 19 districts. This district's head town was at Autlán and it covered 19 municipalities:[15][16]
Ameca, Atemajac de Brizuela, Autlán de Navarro, Casimiro Castillo, Cihuatlán, Cocula, Cuautitlán de García Barragán, Chiquilistlán, Ejutla, El Grullo, Juchitlán, El Limón, San Martín Hidalgo, Tecolotlán, Tenamaxtlán, Tonaya, Tuxcacuesco, Unión de Tula and Villa Corona.
1996–2005
In the 1996 scheme, under which Jalisco lost a single-member seat, the district had its head town at Autlán and it comprised 21 municipalities:[17][16]
Atengo, Autlán de Navarro, Ayutla, Casimiro Castillo, Cihuatlán, Cocula, Cuautitlán de García Barragán, Cuautla, Chiquilistlán, Ejutla, El Grullo, La Huerta, Juchitlán, El Limón, San Martín Hidalgo, Tecolotlán, Tenamaxtlán, Tonaya, Tuxcacuesco, Unión de Tula and Villa Purificación.
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, Jalisco's seat allocation rose from 13 to 20.[11] The restored 18th district's head town was at Tlaquepaque and it covered the municipalities of El Salto, Tonalá and Tlaquepaque.[18]
↑ An amendment to Article 52 of the Constitution in 1928 changed the original provision of "one deputy per 60,000 inhabitants" to "one deputy per 100,000";[4][5] as a result, the size of the Chamber of Deputies fell from 281 in the 1928 election to 171 in 1934.[6]
↑ Originally elected for the PVEM, Gómez Michel switched allegiance to the PRI on 4 September 2012. After he was abducted and murdered in September 2014, his seat was declared vacant on 23 September 2014 and he was replaced by Mestas Gallardo, his alternate, for the remainder of the congressional term.
↑ Originally elected for the PRI, Fletes Araiza joined the Morena bloc in Congress on 12 March 2024.
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