[1] The district was first created ahead of the 1898 Philippine legislative election for two seats in the Malolos Congress.
Epifanio de los Santos and José Turiano Santiago were elected at-large as Nueva Ecija's representatives in the National Assembly of the nascent First Philippine Republic, with a third seat allocated for an appointed delegate from Pampanga, Gregorio Macapinlac.
[3] Nueva Ecija was given one seat in that legislature and continued to elect its representatives from this single-member at-large district until the 1926 reapportionment into two smaller districts which took effect beginning with the 1928 Philippine House of Representatives elections.
[4] Nueva Ecija returned to at-large elections for a seat in the National Assembly of the Second Philippine Republic in 1943.
It was recreated for the last time ahead of the 1984 Philippine parliamentary election following a shift from regional electoral districts in the interim parliament, where Nueva Ecija was included in the multi-member at-large representation of Region III (Central Luzon) from 1978 to 1984, to provincial and city district constituencies in the regular parliament.