The 4th federal electoral district of Chihuahua (Distrito electoral federal 04 de Chihuahua) is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of nine such districts currently operating in the state of Chihuahua.
[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.
Ciudad Juárez also serves as its head town (cabecera distrital), where results from individual polling stations are gathered together and tallied.
[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.