# Legislative districts of Isabela

The legislative districts of Isabela are the representations of the province of Isabela and the independent component city of Santiago in the various national legislatures of the Philippines. The province and the city are currently represented in the lower house of the Congress of the Philippines through their first, second, third, fourth, fifth, and sixth congressional districts.

## History

The province was represented as a lone legislative district until 1972. It was part of the representation of Region II from 1978 to 1984, and from 1984 to 1986, it elected 3 assemblymen at-large. In 1986, it was redistricted into four legislative districts.
On September 27, 2018, President Rodrigo Duterte signed Republic Act No. 11080, increasing the legislative districts from four to six and reapportioned the district assignments of cities and municipalities.

## Six Districts (since 2019)
### 1st District

* City: Ilagan
* Municipalities: Cabagan, Delfin Albano, Divilacan, Maconacon, San Pablo, Santa Maria, Santo Tomas, Tumauini
* Population (2020): 399,196
| Period | Representative |
| 18th Congress 2019–2022 | Antonio T. Albano |
| 19th Congress 2022–2025 | Antonio T. Albano |

### 2nd District

* Municipalities: Benito Soliven, Gamu, Naguilian, Palanan, Reina Mercedes, San Mariano
* Population (2020): 199,903
| Period | Representative |
| 18th Congress 2019–2022 | Ed Christopher S. Go |
| 19th Congress 2022–2025 | Ed Christopher S. Go |

### 3rd District

* Municipalities: Alicia, Angadanan, Cabatuan, Ramon, San Mateo
* Population (2020): 282,027
| Period | Representative |
| 18th Congress 2019–2022 | Ian Paul L. Dy |
| 19th Congress 2022–2025 | Ian Paul L. Dy |

### 4th District

* City: Santiago
* Municipalities: Cordon, Dinapigue, Jones, San Agustin
* Population (2020): 268,602
| Period | Representative |
| 18th Congress 2019–2022 | Alyssa Sheena P. Tan |
| 19th Congress 2022–2025 | Joseph S. Tan |

### 5th District

* Municipalities: Aurora, Burgos, Luna, Mallig, Quezon, Quirino, Roxas, San Manuel
* Population (2020): 267,550
| Period | Representative |
| 18th Congress 2019–2022 | Faustino Michael Carlos T. Dy III |
| 19th Congress 2022–2025 | Faustino Michael Carlos T. Dy III |

### 6th District

* City: Cauayan
* Municipalities: Echague, San Guillermo, San Isidro
* Population (2020): 279,772
| Period | Representative |
| 18th Congress 2019–2022 | Faustino A. Dy V |
| 19th Congress 2022–2025 | Faustino A. Dy V |

## Four Districts (1987–2019)
### 1st District

* City: Ilagan (became a city in 2012)
* Municipalities: Cabagan, Delfin Albano, Divilacan, Maconacon, Palanan, San Pablo, Santa Maria, Santo Tomas, Tumauini
| Period | Representative |
| 8th Congress 1987–1992 | Rodolfo B. Albano, Jr. |
| 9th Congress 1992–1995 | Rodolfo B. Albano, Jr. |
| 10th Congress 1995–1998 | Rodolfo B. Albano, Jr. |
| 11th Congress 1998–2001 | Rodolfo T. Albano III |
| 12th Congress 2001–2004 | Rodolfo B. Albano, Jr. |
| 13th Congress 2004–2007 | Rodolfo T. Albano III |
| 14th Congress 2007–2010 | Rodolfo T. Albano III |
| 15th Congress 2010–2013 | Rodolfo B. Albano, Jr. |
| 16th Congress 2013–2016 | Rodolfo T. Albano III |
| 17th Congress 2016–2019 | Rodolfo T. Albano III |

### 2nd District

* Municipalities: Aurora, Benito Soliven, Burgos, Gamu, Mallig, Naguilian, Quezon, Quirino, Roxas, San Manuel, San Mariano
| Period | Representative |
| 8th Congress 1987–1992 | Simplicio B. Domingo, Jr. |
| 9th Congress 1992–1995 | Faustino S. Dy, Jr. |
| 10th Congress 1995–1998 | Faustino S. Dy, Jr. |
| 11th Congress 1998–2001 | Faustino S. Dy, Jr. |
| 12th Congress 2001–2004 | Edwin C. Uy |
| 13th Congress 2004–2007 | Edwin C. Uy |
| 14th Congress 2007–2010 | Edwin C. Uy |
| 15th Congress 2010–2013 | Ana Cristina S. Go |
| 16th Congress 2013–2016 | Ana Cristina S. Go |
| 17th Congress 2016–2019 | Ana Cristina S. Go |

### 3rd District

* City: Cauayan (became a city in 2001)
* Municipalities: Alicia, Angadanan, Cabatuan, Luna, Reina Mercedes, San Guillermo, San Mateo
| Period | Representative |
| 8th Congress 1987–1992 | Santiago P. Respicio |
| 9th Congress 1992–1995 | Santiago P. Respicio |
| 10th Congress 1995–1998 | Santiago P. Respicio |
| 11th Congress 1998–2001 | Ramon M. Reyes |
| 12th Congress 2001–2004 | Faustino G. Dy III |
| 13th Congress 2004–2007 | Faustino G. Dy III |
| 14th Congress 2007–2010 | Faustino G. Dy III |
| 15th Congress 2010–2013 | Napoleon S. Dy |
| 16th Congress 2013–2016 | Napoleon S. Dy |
| 17th Congress 2016–2019 | Napoleon S. Dy |

### 4th District

* City: Santiago (became a city in 1994)
* Municipalities: Cordon, Dinapigue, Echague, Jones, Ramon, San Agustin, San Isidro
| Period | Representative |
| 8th Congress 1987–1992 | Antonio M. Abaya |
| 9th Congress 1992–1995 | Antonio M. Abaya |
| 10th Congress 1995–1998 | Antonio M. Abaya |
| 11th Congress 1998–2001 | Heherson T. Alvarez |
| 12th Congress 2001–2004 | Antonio M. Abaya |
| 12th Congress 2001–2004 | Giorgidi B. Aggabao |
| 13th Congress 2004–2007 | Anthony Miranda |
| 14th Congress 2007–2010 | Giorgidi B. Aggabao |
| 15th Congress 2010–2013 | Giorgidi B. Aggabao |
| 16th Congress 2013–2016 | Giorgidi B. Aggabao |
| 17th Congress 2016–2019 | Ma. Lourdes R. Aggabao |
Notes
* 1 2 Independent component city since July 4, 1994. Independent from the province and does not vote for provincial officials by virtue of Republic Act No. 7720. Only votes with Isabela for congressional representation.
* ↑ Died on February 26, 2003.
* ↑ Elected to complete the unexpired term of predecessor, assumed office on May 19, 2003.

## Lone District (defunct)

| Period | Representative |
| 1st Philippine Legislature 1907–1909 | Nicasio Claravall |
| 1st Philippine Legislature 1907–1909 | Dimas Guzman |
| 2nd Philippine Legislature 1909–1912 | Eliseo Claravall |
| 3rd Philippine Legislature 1912–1916 | Eliseo Claravall |
| 4th Philippine Legislature 1916–1919 | Mauro Verzosa |
| 5th Philippine Legislature 1919–1922 | Miguel Binag |
| 6th Philippine Legislature 1922–1925 | Tolentino Verzosa |
| 7th Philippine Legislature 1925–1928 | Manuel Nieto |
| 8th Philippine Legislature 1928–1931 | Pascual Paguirigan |
| 9th Philippine Legislature 1931–1934 | Silvestre Macutay |
| 10th Philippine Legislature 1934–1935 | Silvino Gumpal |
| 1st National Assembly 1935–1938 | Mauro Verzosa |
| 2nd National Assembly 1938–1941 | Mauro Verzosa |
| 1st Commonwealth Congress 1945 | Lino J. Castillejos |
| 1st Congress 1946–1949 | Domingo Paguirigan |
| 2nd Congress 1949–1953 | Samuel Reyes |
| 3rd Congress 1953–1957 | Samuel Reyes |
| 4th Congress 1957–1961 | Delfin B. Albano |
| 5th Congress 1961–1965 | Delfin B. Albano |
| 6th Congress 1965–1969 | Melanio T. Singson |
| 7th Congress 1969–1972 | Rodolfo B. Albano, Jr. |
Notes
* ↑ Unseated by the Assembly.

## At-Large (defunct)
### 1943–1944

| Period | Representative |
| National Assembly 1943–1944 | Lino J. Castillejos |
| National Assembly 1943–1944 | Gregorio P. Formoso |

### 1984–1986

| Period | Representative |
| Regular Batasang Pambansa 1984–1986 | Rodolfo B. Albano, Jr. |
| Regular Batasang Pambansa 1984–1986 | Prospero G. Bello |
| Regular Batasang Pambansa 1984–1986 | Simplicio B. Domingo, Jr. |