Isabela's at-large congressional district

Isabela's at-large congressional district refers to the lone congressional district of the Philippines in the province of Isabela for various national legislatures before 1987. The province elected its representatives province-wide at-large from its reorganization under Article 6 of the Decreto de 18 junio de 1898 y las instrucciones sobre el régimen de las provincias y pueblos for the Malolos Congress in 1898 until it was reapportioned in 1987 under Section 1 of the ordinance annex of the 1987 Constitution of the Philippines into a first, second, third and fourth district. It was a single-member district throughout the ten legislatures of the Insular Government of the Philippine Islands from 1907 to 1935, the three legislatures of the Philippine Commonwealth from 1935 to 1946, and the seven congresses of the Third Philippine Republic from 1946 to 1972.

On three occasions in its history, Isabela sent more than one member to the national legislatures who were also elected or appointed at-large. Three representatives were sent to the National Assembly (Malolos Congress) of the First Philippine Republic from 1898 to 1901, two representatives to the National Assembly of the Second Philippine Republic from 1943 to 1944, and three representatives to the national parliament of the Fourth Philippine Republic from 1984 to 1986.

After 1986, all representatives were elected from congressional districts.

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;" |

Isabela de Luzon's at-large district for the Malolos Congress
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Legislature ! colspan=4 | Single seat !Start!!End ! 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="color:inherit;background:;" |
 * Raymundo Alindada
 * Independent
 * Elected in 1898.
 * style="color:inherit;background:;" |
 * Abelardo Guzmán
 * Independent
 * Elected in 1898.
 * style="color:inherit;background:;" |
 * Eustacio del Rosario
 * Independent
 * Appointed
 * style="color:inherit;background:;" |
 * Eustacio del Rosario
 * Independent
 * Appointed
 * Appointed
 * rowspan=2 |
 * rowspan=23 colspan=10 style="text-align:center;" | Seats eliminated
 * - style="height:3em"
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's at-large district for the Philippine Assembly
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Legislature ! colspan=4 | Single seat !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="9" style="text-align:center;" | District re-created January 9, 1907.
 * style="text-align:center;" | 1
 * October 16, 1907
 * January 20, 1908
 * rowspan="2" style="text-align:center;" | 1st
 * rowspan="4" |
 * style="color:inherit;background:;" |
 * Nicasio P. Claraváll
 * Progresista
 * Elected in 1907. Election annulled by the Assembly after an electoral protest.
 * style="text-align:center;" | 2
 * January 20, 1908
 * March 18, 1909
 * style="color:inherit;background:;" |
 * Dimas Guzmán
 * Nacionalista
 * Declared winner of 1907 elections. Died.
 * rowspan="2" style="text-align:center;" | 3
 * rowspan="2" | October 16, 1909
 * rowspan="2" | October 16, 1916
 * style="text-align:center;" | 2nd
 * rowspan="2" style="color:inherit;background:;" |
 * rowspan="2" | Eliseo Claraváll
 * rowspan="2" | Progresista
 * Elected in 1909.
 * style="text-align:center;" | 3rd
 * Re-elected in 1912.
 * rowspan="2" | Progresista
 * Elected in 1909.
 * style="text-align:center;" | 3rd
 * Re-elected in 1912.
 * Re-elected in 1912.
 * rowspan=2 |
 * - style="height:3em"
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's at-large district for the House of Representatives of the Philippine Islands
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | National Assembly ! colspan=4 | Single seat !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * style="text-align:center;" | 4
 * October 16, 1916
 * June 3, 1919
 * style="text-align:center;" | 4th
 * rowspan=7 |
 * style="color:inherit;background:;" |
 * Mauro Verzosa
 * Nacionalista
 * Elected in 1916.
 * style="text-align:center;" | 5
 * June 3, 1919
 * June 6, 1922
 * style="text-align:center;" | 5th
 * style="color:inherit;background:;" |
 * Miguel Binag
 * Nacionalista
 * Elected in 1919.
 * style="text-align:center;" | 6
 * June 6, 1922
 * June 2, 1925
 * style="text-align:center;" | 6th
 * style="background-color:#191970|
 * Tolentino Verzosa
 * Nacionalista Colectivista
 * Elected in 1922.
 * style="text-align:center;" | 7
 * June 2, 1925
 * June 5, 1928
 * style="text-align:center;" | 7th
 * style="color:inherit;background:;" |
 * Manuel Nieto
 * Nacionalista Consolidado
 * Elected in 1925.
 * style="text-align:center;" | 8
 * June 5, 1928
 * June 2, 1931
 * style="text-align:center;" | 8th
 * style="color:inherit;background:;" |
 * Pascual Paguirigan
 * Nacionalista Consolidado
 * Elected in 1928.
 * style="text-align:center;" | 9
 * June 2, 1931
 * June 5, 1934
 * style="text-align:center;" | 9th
 * style="color:inherit;background:;" |
 * Silvestre B. Macutay
 * Nacionalista Consolidado
 * Elected in 1931.
 * style="text-align:center;" | 10
 * June 5, 1934
 * September 16, 1935
 * style="text-align:center;" | 10th
 * style="color:inherit;background:;" |
 * Silvino M. Gumpal
 * Nacionalista Demócrata Pro-Independencia
 * Elected in 1934.
 * June 5, 1934
 * September 16, 1935
 * style="text-align:center;" | 10th
 * style="color:inherit;background:;" |
 * Silvino M. Gumpal
 * Nacionalista Demócrata Pro-Independencia
 * Elected in 1934.
 * rowspan=2 |
 * - style="height:3em"
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's at-large district for the National Assembly (Commonwealth of the Philippines)
! 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
 * rowspan="2" style="text-align:center;" | (4)
 * rowspan="2" | September 16, 1935
 * rowspan="2" | December 30, 1941
 * style="text-align:center;" | 1st
 * rowspan=2 |
 * style="color:inherit;background:;" |
 * rowspan="2" | Mauro Verzosa
 * Nacionalista Democrático
 * Elected in 1935.
 * style="text-align:center;" | 2nd
 * style="color:inherit;background:;" |
 * Nacionalista
 * Re-elected in 1938.
 * Nacionalista
 * Re-elected in 1938.
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=5 colspan=5 style="text-align:center;" | Seats restored
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

Isabela's at-large district for the National Assembly (Second Philippine Republic)
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Common wealth Congress ! colspan=4 | Single seat !Start!!End ! 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="color:inherit;background:;" |
 * Gregorio P. Formoso
 * KALIBAPI
 * Elected in 1943.
 * style="color:inherit;background:;" |
 * Lino J. Castillejo
 * KALIBAPI
 * Appointed as an ex officio member.
 * style="color:inherit;background:;" |
 * Lino J. Castillejo
 * KALIBAPI
 * Appointed as an ex officio member.
 * rowspan=2 |
 * rowspan=17 colspan=10 style="text-align:center;" | Seats eliminated
 * - style="height:3em"
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's at-large district for the House of Representatives of the Commonwealth of the Philippines
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Congress ! colspan=4 | Single seat !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="9" style="text-align:center;" | District re-created May 24, 1945.
 * style="text-align:center;" | 11
 * June 9, 1945
 * May 25, 1946
 * style="text-align:center;" | 1st
 * style="color:inherit;background:;" |
 * Lino J. Castillejo
 * Nacionalista
 * Elected in 1941.
 * Lino J. Castillejo
 * Nacionalista
 * Elected in 1941.
 * rowspan=2 |
 * - style="height:3em"
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's at-large district for the House of Representatives of the Philippines
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Batasang Pambansa ! 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
 * style="text-align:center;" | 12
 * May 25, 1946
 * December 30, 1949
 * style="text-align:center;" | 1st
 * rowspan=8 |
 * style="color:inherit;background:;" |
 * Domingo Paguirigan
 * Liberal
 * Elected in 1946.
 * rowspan="2" style="text-align:center;" | 13
 * rowspan="2" | December 30, 1949
 * rowspan="2" | January 23, 1957
 * style="text-align:center;" | 2nd
 * rowspan="2" style="color:inherit;background:;" |
 * rowspan="2" | Samuel F. Reyes
 * rowspan="2" | Liberal
 * Elected in 1949.
 * rowspan="2" style="text-align:center;" | 3rd
 * Re-elected in 1953. Election annulled by the House electoral tribunal after an electoral protest.
 * rowspan="3" style="text-align:center;" | 14
 * rowspan="3" | January 23, 1957
 * rowspan="3" | December 30, 1965
 * rowspan="3" style="color:inherit;background:;" |
 * rowspan="3" | Delfín B. Albano
 * rowspan="3" | Nacionalista
 * Declared winner of 1953 elections.
 * style="text-align:center;" | 4th
 * Re-elected in 1957.
 * style="text-align:center;" | 5th
 * Re-elected in 1961. Oath of office deferred to 1963 due to electoral protest.
 * style="text-align:center;" | 15
 * December 30, 1965
 * December 30, 1969
 * style="text-align:center;" | 6th
 * style="color:inherit;background:;" |
 * Melanio T. Singson
 * Liberal
 * Elected in 1965.
 * style="text-align:center;" | 16
 * December 30, 1969
 * September 23, 1972
 * style="text-align:center;" | 7th
 * style="color:inherit;background:;" |
 * Rodolfo B. Albano Jr.
 * Nacionalista
 * Elected in 1969. Removed from office after imposition of martial law.
 * colspan="9" style="text-align:center;" | District dissolved into the seven-seat Region II's at-large district for the Interim Batasang Pambansa.
 * December 30, 1969
 * September 23, 1972
 * style="text-align:center;" | 7th
 * style="color:inherit;background:;" |
 * Rodolfo B. Albano Jr.
 * Nacionalista
 * Elected in 1969. Removed from office after imposition of martial law.
 * colspan="9" style="text-align:center;" | District dissolved into the seven-seat Region II's at-large district for the Interim Batasang Pambansa.
 * colspan="9" style="text-align:center;" | District dissolved into the seven-seat Region II's at-large district for the Interim Batasang Pambansa.
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="19" style="text-align:center;" |
 * colspan="19" style="text-align:center;" |

Isabela's at-large district for the Regular Batasang Pambansa

 * colspan="19" 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="color:inherit;background:;" |
 * Rodolfo B. Albano Jr.
 * KBL
 * Elected in 1984.
 * style="color:inherit;background:;" |
 * Prospero G. Bello
 * KBL
 * Elected in 1984.
 * style="color:inherit;background:;" |
 * Simplicio B. Domingo Jr.
 * KBL
 * Elected in 1984.
 * colspan="19" style="text-align:center;" | District dissolved into Isabela's 1st, 2nd, 3rd and 4th districts.
 * }
 * KBL
 * Elected in 1984.
 * colspan="19" style="text-align:center;" | District dissolved into Isabela's 1st, 2nd, 3rd and 4th districts.
 * }
 * }