Ilocos Norte's at-large congressional district

Ilocos Norte's at-large congressional district is an obsolete electoral district that was used for electing members of Philippine national legislatures in Ilocos Norte before 1987.

Ilocos Norte first elected its representatives at-large during the 1898 Philippine legislative election for six seats in the Malolos Congress, the National Assembly of the First Philippine Republic. Following the installation of U.S. civil government in 1901 and the reorganization of provinces for the Philippine Assembly, Ilocos Norte was divided into a first and second district. The provincewide district was re-created ahead of the 1943 Philippine legislative election for a seat in the National Assembly of the Second Philippine Republic, with an additional seat assigned to its provincial governor. The district became inactive again following the restoration of the House of Representatives in 1945 when Ilocos Norte returned to electing its representatives from its two districts. In the unicameral Batasang Pambansa that replaced the House in 1978, Ilocos Norte was included in the multi-member regional electoral district of Region I (Ilocos Region) for its interim parliament. The district was again utilized in the 1984 Philippine parliamentary election when Ilocos Norte was granted two seats in the regular parliament.

After 1986, Ilocos Norte elected its representatives from its two single-member congressional districts restored under a new constitution.

Representation history
{| class=wikitable ! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | National Assembly ! colspan=4 | Seat A ! colspan=4 | Seat B ! colspan=4 | Seat C ! colspan=4 | Seat D ! colspan=4 | Seat E ! colspan=4 | Seat F !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="34" style="text-align:center;" |
 * colspan="34" style="text-align:center;" |

Ilocos Norte's at-large district for the Malolos Congress
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | National Assembly ! colspan=4 | Seat A ! colspan=4 | Seat B !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="34" style="text-align:center;" | District created June 18, 1898.
 * - style="height:3em"
 * style="text-align:center;" | –
 * September 15, 1898
 * March 23, 1901
 * style="text-align:center;" | 1st
 * style="background:;" |
 * Gregorio Aglipay
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Primitivo Donato
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Martín García
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * José Luna
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Pedro Paterno
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Pío Romero
 * Independent
 * Elected in 1898.
 * Pedro Paterno
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Pío Romero
 * Independent
 * Elected in 1898.
 * Elected in 1898.
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

Ilocos Norte's at-large district for the National Assembly (Second Philippine Republic)
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Batasang Pambansa ! colspan=4 | Seat A ! colspan=4 | Seat B !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="14" style="text-align:center;" | District re-created September 7, 1943.
 * style="text-align:center;" | –
 * September 25, 1943
 * February 2, 1944
 * style="text-align:center;" | 1st
 * style="background:;" |
 * Conrado Rubio
 * KALIBAPI
 * Elected in 1943.
 * style="background:;" |
 * Emilio L. Medina
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into Ilocos Norte's 1st and 2nd districts.
 * Emilio L. Medina
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into Ilocos Norte's 1st and 2nd districts.
 * colspan="14" style="text-align:center;" | District dissolved into Ilocos Norte's 1st and 2nd districts.
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

Ilocos Norte's at-large district for the Regular Batasang Pambansa

 * colspan="14" style="text-align:center;" | District re-created February 1, 1984.
 * - style="height:3em"
 * style="text-align:center;" | –
 * July 23, 1984
 * March 25, 1986
 * style="text-align:center;" | 2nd
 * style="background:;" |
 * Imee Marcos
 * KBL
 * Elected in 1984.
 * style="background:;" |
 * Antonio Raquiza
 * KBL
 * Elected in 1984.
 * colspan="14" style="text-align:center;" | District dissolved into Ilocos Norte's 1st and 2nd districts.
 * }
 * Elected in 1984.
 * colspan="14" style="text-align:center;" | District dissolved into Ilocos Norte's 1st and 2nd districts.
 * }
 * }