[1] 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.

[5] Its head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is Ciudad Juárez.

Between 1996 and 2005, the 1st district's territory was in the north and north-east of the state, covering the municipalities of Ahumada, Ascensión, Buenaventura, Casas Grandes, Galeana, Gómez Farías, Guadalupe, Ignacio Zaragoza, Janos, Madera, Matachí, Namiquipa, Nuevo Casas Grandes, Práxedis G. Guerrero and Temósachi; it was centred on the city of Nuevo Casas Grandes.

[8] 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.