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 second region.

[1][2] The district's head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the state capital, the city of Aguascalientes, Ags.

[3] Under the 2005 redistricting process, it was made up of the eastern portion of the municipality of Aguascalientes.

[4] Between 1996 and 2005, the district was composed of northern portion of the municipality of Aguascalientes.