From 1979 onwards, votes cast in the district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the country's electoral regions.

[1][2] The 25th, 26th and 27th districts were abolished in the National Electoral Institute's 2017 redistricting process because the capital's population no longer warranted that number of seats in Congress.

[3] In its final form, when the capital accounted for 27 districts, the 25th covered 89 electoral precincts (secciones electorales) in the north of the borough of Xochimilco and 77 precincts in the borough of Iztapalapa.

[5][7] 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.

[8] The 25th district covered a part of the borough of Gustavo A. Madero in the north of the city.