[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 fifth region.

The configuration was broadly the same as the 2022 plan: Briseñas, Chavinda, Jacona and Tangamandapío were not included, while Peribán and Los Reyes were.

[9][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.

[10] The 4th district's head town was at La Piedad and it covered nine municipalities in the north of the state: Angamacutiro, Churintzio, José Sixto Verduzco, La Piedad, Numarán, Panindícuaro, Penjamillo, Puruándiro and Zináparo.