| # | Image | Member | Term of office | Legislature | Party | Electoral history | Constituent LGUs |
|---|
| Start | End |
|---|
|
| District created January 9, 1907.[6][7] |
| 1 | |  | Irineo Javier | October 16, 1907 | October 16, 1912 | 1st | Nacionalista | Elected in 1907. | 1907–1909 Bacarra,Bangui,Laoag,Pasuquin,Piddig,San Miguel |
| 2nd | Re-elected in 1909. | 1909–1916 Bacarra,Bangui,Laoag,Pasuquin,Piddig,San Miguel,Vintar |
| 2 | |  | Santiago A. Fonacier | October 16, 1912 | October 16, 1916 | 3rd | Nacionalista | Elected in 1912. |
Ilocos Norte's 1st district for the House of Representatives of the Philippine Islands[edit] |
| 3 | |  | Vicente T. Llanes | October 16, 1916 | June 6, 1922 | 4th | Nacionalista | Elected in 1916. | 1916–1935 Bacarra,Bangui,Burgos,Laoag,Pasuquin,Piddig,Sarrat,Vintar |
| 5th | Re-elected in 1919. |
| 4 | |  | Irineo Ranjo | June 6, 1922 | June 2, 1925 | 6th | Nacionalista Colectivista | Elected in 1922. |
| 5 | | | Severo Hernando | June 2, 1925 | June 2, 1931 | 7th | Nacionalista Consolidado | Elected in 1925. |
| 8th | Re-elected in 1928. |
| 6 | |  | Vicente T. Lazo | June 2, 1931 | September 16, 1935 | 9th | Nacionalista Consolidado | Elected in 1931. |
| 10th | Nacionalista Democrático | Re-elected in 1934. |
| # | Image | Member | Term of office | National Assembly | Party | Electoral history | Constituent LGUs |
|---|
| Start | End |
|---|
|
| (6) | |  | Vicente T. Lazo | September 16, 1935 | December 30, 1941 | 1st | Nacionalista Democrático | Re-elected in 1935. | 1935–1941 Bacarra,Bangui,Burgos,Laoag,Pasuquin,Piddig,Sarrat,Vintar |
| 2nd | Nacionalista | Re-elected in 1938. |
| District dissolved into the two-seatIlocos Norte's at-large district for theNational Assembly (Second Philippine Republic). |
| # | Image | Member | Term of office | Common wealth Congress | Party | Electoral history | Constituent LGUs |
|---|
| Start | End |
|---|
Ilocos Norte's 1st district for the House of Representatives of the Commonwealth of the Philippines[edit] |
| District re-created May 24, 1945. |
| (6) | |  | Vicente T. Lazo | June 11, 1945 | May 25, 1946 | 1st | Nacionalista | Re-elected in 1941. | 1945–1946 Bacarra,Bangui,Burgos,Laoag,Pasuquin,Piddig,Sarrat,Vintar |
| # | Image | Member | Term of office | Congress | Party | Electoral history | Constituent LGUs |
|---|
| Start | End |
|---|
|
| 7 | |  | Dámaso T. Samonte | May 25, 1946 | December 30, 1949 | 1st | Liberal | Elected in 1946. | 1946–1961 Bacarra,Bangui,Burgos,Laoag,Pasuquin,Piddig,Sarrat,Vintar |
| 8 | |  | Antonio V. Raquiza | December 30, 1949 | December 30, 1955 | 2nd | Liberal | Elected in 1949. |
| 3rd | Re-elected in 1953. Resigned on election asIlocos Norte governor. |
| December 30, 1957 | August 24, 1966 | 4th | Re-elected in 1957. |
| 5th | Re-elected in 1961. | 1961–1972 Bacarra,Bangui,Burgos,Laoag,Pagudpud,Pasuquin,Piddig,Sarrat,Vintar |
| 6th | Re-elected in 1965. Resigned on appointment asSecretary of Public Works, Transportation and Communications. |
| 9 | |  | Roque R. Ablan Jr. | January 22, 1968 | September 23, 1972 | Nacionalista | Elected in 1967 to finish Raquiza's term. |
| 7th | Re-elected in 1969. Removed from office afterimposition of martial law. |
| District dissolved into the twelve-seat Region I's at-large district for the Interim Batasang Pambansa, followed by the two-seatIlocos Norte's at-large district for the Regular Batasang Pambansa. |
| District re-created February 2, 1987. |
| (9) | |  | Roque R. Ablan Jr. | June 30, 1987 | June 30, 1998 | 8th | KBL | Elected in 1987. | 1987–present Adams,Bacarra,Bangui,Burgos,Carasi,Dumalneg,Laoag,Pagudpud,Pasuquin,Piddig,Sarrat,Vintar |
| 9th | Re-elected in 1992. |
| 10th | Lakas | Re-elected in 1995. |
| 10 | | | Rodolfo Fariñas | June 30, 1998 | June 30, 2001 | 11th | Independent | Elected in 1998. |
| (9) | |  | Roque R. Ablan Jr. | June 30, 2001 | June 30, 2010 | 12th | Lakas | Elected in 2001. |
| 13th | Re-elected in 2004. |
| 14th | Lakas | Re-elected in 2007. |
| (10) | | | Rodolfo Fariñas | June 30, 2010 | June 30, 2019 | 15th | Nacionalista | Elected in 2010. |
| 16th | Liberal | Re-elected in 2013. |
| 17th | PDP–Laban | Re-elected in 2016. |
| 11 | | | Ria Christina G. Fariñas | June 30, 2019 | June 30, 2022 | 18th | PDP–Laban | Elected in 2019. |
| 12 | |  | Ferdinand Alexander “Sandro” A. Marcos III | June 30, 2022 | Incumbent | 19th | Nacionalista | Elected in 2022. |
| PFP |
| 20th | Elected in 2025. |