It elects one deputy to the lower house of Congress for each three-year legislative period 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 fourth electoral region.[2][3][a]
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,[7] the district's head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the city of Actopan.[1] Hidalgo's 3rd covers 263 electoral precincts (secciones electorales) across 12 of the state's municipalities:[8][9]
Under the 2017 plan, the district covered 19 municipalities:[13][14]
Actopan, Ajacuba, Atotonilco el Grande, El Arenal, Eloxochitlán, Francisco I. Madero, Huasca de Ocampo, Juárez Hidalgo, Metztitlán, Mineral del Chico, Mineral del Monte, Mixquiahuala de Juárez, Omitlán de Juárez, San Agustín Metzquititlán, San Agustín Tlaxiaca, Tetepango, Tlahuelilpan, Tlahuiltepa and Zacualtipán de Ángeles.
2005–2017
Between 2005 and 2017, it comprised 19 municipalities:[15][16]
Actopan, Ajacuba, Atotonilco El Grande, El Arenal, Eloxochitlán, Francisco I. Madero, Juárez Hidalgo, Metztitlán, Mineral del Chico, Mixquiahuala de Juárez, Molango de Escamilla, Progreso de Obregón, San Agustín Metzquititlán, San Agustín Tlaxiaca, Tetepango, Tlahuelilpan, Tlahuiltepa, Xochicoatlán and Zacualtipán de Ángeles.
1996–2005
The 1996 redistricting process created Hidalgo's 7th district. The 3rd district comprised 15 municipalities:[17][16]
Actopan, Atotonilco El Grande, El Arenal, Eloxochitlán, Francisco I. Madero, Juárez Hidalgo, Metztitlán, Progreso de Obregón, San Agustín Metzquititlán, Tlahuiltepa, Xochicoatlán, Zacualtipán de Ángeles, Santiago de Anaya, San Salvador and Tianguistengo.
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, Hidalgo's seat allocation rose from five to six.[10] The 3rd district's head town was at Tula de Allende and it covered 14 municipalities.[18]
Ajacuba, Atitalaquía, Atotonilco de Tula, Chilcuautla, Francisco I. Madero, Mixquiahuala, Progreso, Tepeji del Río, Tepetitlán, Tetepango, Tezontepec, Tlahuelilpan, Taxcoapan and Tula de Allende.
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