| Isabela's 4th congressional district | |
| Electorate: | 181,913 (2019)[1] |
| Blank2 Name: | Congressional bloc |
| Blank1 Info: | PFP |
| Blank1 Name: | Political party |
| Members: | Joseph S. Tan |
| Members Label: | Representative |
| Year: | 1987 |
| Area: | 1922.44sqkm |
| Population: | 251,307 (2015)[2] |
| Parl Name: | House of Representatives of the Philippines |
| Region: | Cagayan Valley |
| Region Label: | Region |
| District: | Isabela |
| District Label: | Province |
| Caption2: | Location of Isabela within the Philippines |
| Blank2 Info: | Majority |
Isabela's 4th 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 of the Philippines since 1987.[3] The district consists of the independent component city of Santiago and the municipalities of Cordon, Dinapigue, Jones, and San Agustin. It is currently represented in the 19th Congress by Joseph S. Tan of the Partido Federal ng Pilipinas (PFP).[4]
| Member | Term of office | Congress | Party | Electoral history | ConstituentLGUs | |||
|---|---|---|---|---|---|---|---|---|
| Start | End | |||||||
| District created February 2, 1987 from Isabela's at-large district. | ||||||||
| 1 | Antonio M. Abaya | June 30, 1987 | June 30, 1998 | 8th | KBL | Elected in 1987. | 1987–2019:Cordon, Dinapigue, Echague, Jones, Ramon, San Agustin, San Isidro, Santiago | |
| 9th | NPC | Re-elected in 1992. | ||||||
| 10th | Lakas | Re-elected in 1995. | ||||||
| 2 | Heherson Alvarez | June 30, 1998 | June 30, 2001 | 11th | Lakas | Elected in 1998. | ||
| (1) | Antonio M. Abaya | June 30, 2001 | February 26, 2003 | 12th | Lakas | Elected in 2001.Died in office. | ||
| Vacant | February 26, 2003 | May 19, 2003 | ||||||
| 3 | Giorgidi B. Aggabao | May 19, 2003 | June 30, 2004 | 12th | NPC | Elected to finish Abaya's term. | ||
| 4 | Anthony Miranda | June 30, 2004 | June 30, 2007 | 13th | KAMPI | Elected in 2004. | ||
| (3) | Giorgidi B. Aggabao | June 30, 2007 | June 30, 2016 | 14th | NPC | Elected in 2007. | ||
| 15th | Re-elected in 2010. | |||||||
| 16th | Re-elected in 2013. | |||||||
| 5 | Ma. Lourdes R. Aggabao | June 30, 2016 | June 30, 2019 | 17th | NPC | Elected in 2016. | ||
| 6 | Alyssa Sheena P. Tan | June 30, 2019 | June 30, 2022 | 18th | PFP | Elected in 2019. | 2019–present:Cordon, Dinapigue, Jones, San Agustin, Santiago | |
| 7 | Joseph S. Tan | June 30, 2022 | Incumbent | 19th | PDP–Laban | Elected in 2022. | ||
|-bgcolor=black|colspan=5|