La Union's at-large congressional district

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

La Union first elected its representatives at-large during the 1898 Philippine legislative election for a seat in the Malolos Congress, the National Assembly of the First Philippine Republic, with additional seats granted to two appointed delegates. Following the installation of U.S. civil government in 1901 and the reorganization of provinces for the Philippine Assembly, La Union was divided into a first and second district. The provincewide electoral 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 La Union returned to electing its representatives from its two districts. In the unicameral Batasang Pambansa that replaced the House in 1978, La Union 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 La Union was granted two seats in the regular parliament.

After 1986, La Union 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 !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
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="19" style="text-align:center;" |
 * colspan="19" style="text-align:center;" |

Union'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="19" 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:;" |
 * Joaquín Luna
 * Independent
 * Elected in 1898.
 * style="background:;" |
 * Miguel Paterno
 * Independent
 * Appointed.
 * style="background:;" |
 * Mateo del Rosario
 * Independent
 * Appointed.
 * style="background:;" |
 * Mateo del Rosario
 * Independent
 * Appointed.
 * Appointed.
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

La Union'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:;" |
 * Rufino Macagba
 * KALIBAPI
 * Elected in 1943.
 * style="background:;" |
 * Bonifacio Tadiar
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into La Union's 1st and 2nd districts.
 * Bonifacio Tadiar
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into La Union's 1st and 2nd districts.
 * colspan="14" style="text-align:center;" | District dissolved into La Union's 1st and 2nd districts.
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

La Union'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:;" |
 * Jose Aspiras
 * KBL
 * Elected in 1984.
 * style="background:;" |
 * Joaquin L. Ortega
 * KBL
 * Elected in 1984.
 * colspan="14" style="text-align:center;" | District dissolved into La Union's 1st and 2nd districts.
 * }
 * Elected in 1984.
 * colspan="14" style="text-align:center;" | District dissolved into La Union's 1st and 2nd districts.
 * }
 * }