Isabela's 1st congressional district

Isabela's 1st congressional district is one of the six congressional districts of the Philippines in the province of Isabela. It has been represented in the House of Representatives since 1987. The district consists of the capital city of Ilagan and the northern municipalities of Cabagan, Delfin Albano, Divilacan, Maconacon, San Pablo, Santa Maria, Santo Tomas and Tumauini. The municipality of Palanan was part of this district until it was redistricted to the 2nd district, effective in 2019. It is currently represented in the 19th Congress by Antonio T. Albano of the Lakas–CMD.

Representation history
{| class=wikitable ! rowspan="2" | # ! rowspan="2" colspan=2 | Member ! colspan=2 | Term of office ! rowspan="2" | Congress ! rowspan="2" | Party ! rowspan="2" | Electoral history ! rowspan="2" | Constituent LGUs !Start!!End
 * colspan="9" style="text-align:center;" |
 * colspan="9" style="text-align:center;" |

Isabela's 1st district for the House of Representatives of the Philippines

 * colspan="9" style="text-align:center;" | District created February 2, 1987 from Isabela's at-large district.
 * rowspan="3" style="text-align:center;" | 1
 * rowspan="2" style="color:inherit;background:;" |
 * rowspan="3" | Rodolfo B. Albano Jr.
 * rowspan="3" | June 30, 1987
 * rowspan="3" | June 30, 1998
 * style="text-align:center;" | 8th
 * rowspan="2" | KBL
 * Elected in 1987.
 * rowspan="10" style="text-align:center;" | 1987–2019 Cabagan, Delfin Albano, Divilacan, Ilagan, Maconacon, Palanan, San Pablo, Santa Maria, Santo Tomas, Tumauini
 * style="text-align:center;" | 9th
 * Re-elected in 1992.
 * style="color:inherit;background:;" |
 * style="text-align:center;" | 10th
 * Lakas
 * Re-elected in 1995.
 * style="text-align:center;" | 2
 * style="color:inherit;background:;" |
 * Rodolfo Albano III
 * June 30, 1998
 * June 30, 2001
 * style="text-align:center;" | 11th
 * Lakas
 * Elected in 1998.
 * style="text-align:center;" | (1)
 * style="color:inherit;background:;" |
 * Rodolfo B. Albano Jr.
 * June 30, 2001
 * January 21, 2004
 * style="text-align:center;" | 12th
 * Lakas
 * Elected in 2001. Resigned on appointment as commissioner of the Energy Regulatory Commission.
 * rowspan="2" style="text-align:center;" | (2)
 * style="color:inherit;background:;" |
 * rowspan="2" | Rodolfo Albano III
 * rowspan="2" | June 30, 2004
 * rowspan="2" | June 30, 2010
 * style="text-align:center;" | 13th
 * KAMPI
 * Elected in 2004.
 * style="color:inherit;background:;" |
 * style="text-align:center;" | 14th
 * Lakas
 * Re-elected in 2007.
 * style="text-align:center;" | (1)
 * style="color:inherit;background:;" |
 * Rodolfo B. Albano Jr.
 * June 30, 2010
 * June 30, 2013
 * style="text-align:center;" | 15th
 * NPC
 * Elected in 2010.
 * rowspan="2" style="text-align:center;" | (2)
 * rowspan="2" style="color:inherit;background:;" |
 * rowspan="2" | Rodolfo Albano III
 * rowspan="2" | June 30, 2013
 * rowspan="2" | June 30, 2019
 * style="text-align:center;" | 16th
 * rowspan="2" | NPC
 * Elected in 2013.
 * style="text-align:center;" | 17th
 * Re-elected in 2016.
 * rowspan="2" style="text-align:center;" | 3
 * style="color:inherit;background:;" |
 * rowspan="2" | Antonio T. Albano
 * rowspan="2" | June 30, 2019
 * rowspan="2" | Incumbent
 * style="text-align:center;" | 18th
 * NUP
 * Elected in 2019.
 * rowspan="2" style="text-align:center;" | 2019–present Cabagan, Delfin Albano, Divilacan, Ilagan, Maconacon, San Pablo, Santa Maria, Santo Tomas, Tumauini
 * style="color:inherit;background:;" |
 * style="text-align:center;" | 19th
 * Lakas
 * Re-elected in 2022.
 * }
 * rowspan="2" | Antonio T. Albano
 * rowspan="2" | June 30, 2019
 * rowspan="2" | Incumbent
 * style="text-align:center;" | 18th
 * NUP
 * Elected in 2019.
 * rowspan="2" style="text-align:center;" | 2019–present Cabagan, Delfin Albano, Divilacan, Ilagan, Maconacon, San Pablo, Santa Maria, Santo Tomas, Tumauini
 * style="color:inherit;background:;" |
 * style="text-align:center;" | 19th
 * Lakas
 * Re-elected in 2022.
 * }
 * }