The 40th federal electoral district of the Federal District () is a defunct federal electoral district of Mexico. Occupying a portion of what is today Mexico City, it was in existence from 1978 to 1996.
During that time, it returned one deputy to the Chamber of Deputies for each three-year legislative session by means of the first-past-the-post system, electing its first in the 1979 mid-terms and its last in the 1994 general election. Votes cast in the district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the country's electoral regions.
The 31st to 40th districts were abolished by the Federal Electoral Institute (IFE) in its 1996 redistricting process because the capital's population no longer warranted that number of seats in Congress.
District territory + Evolution of electoral district numbers 1974 1978 1996 2005 2017 2023 Mexico City (Federal District) 27 40 30 27 24 22 Chamber of Deputies 196 300 Sources:
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, the Federal District's seat allocation rose from 27 to 40. The 40th district was located in the south-east of the city and covered the whole of the boroughs of Tláhuac and Milpa Alta and a portion of Iztapalapa. The link contains an exact description of the district's territory.
Deputies returned to Congress
+ Federal District's 40th district Election Deputy Party Term Legislature1979Mario Alfonso Berumen Ramírez 1979–198251st Congress1982 1982–198552nd Congress1985 1985–198853rd Congress1988Álvaro Garcés Rojas 1988–199154th Congress1991José Merino Castrejón 1991–199455th Congress1994Florentino Castro López 1994–199756th Congress
References