| # | Member | Term of office | Legislature | Party | Electoral history | Constituent
LGUs |
|---|
| Start | End |
|---|
|
| District created January 9, 1907.[5][6] |
| 1 | | Maximino Mina | October 16, 1907 | October 16, 1909 | 1st | Nacionalista | Elected in 1907. | 1907–1912
Candon, Narvacan, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Tagudin |
| 2 | | José María Valle | October 16, 1909 | October 16, 1912 | 2nd | Progresista | Elected in 1909. |
| 3 | | Gregorio Talavera | October 16, 1912 | October 16, 1916 | 3rd | Progresista | Elected in 1912. | 1912–1916
Candon, Narvacan, San Esteban, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Tagudin |
Ilocos Sur's 2nd district for the House of Representatives of the Philippine Islands |
| 4 | | Ponciano Morales | October 16, 1916 | June 6, 1922 | 4th | Nacionalista | Elected in 1916. | 1916–1919
Candon, Narvacan, San Esteban, Santa Cruz, Santa Lucia, Santa Maria, Santiago |
| 5th | Re-elected in 1919. | 1919–1922
Banayoyo, Candon, Lidlidda, Nagbukel, Narvacan, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago |
| 5 | | Lupo T. Biteng | June 6, 1922 | June 5, 1928 | 6th | Nacionalista
Colectivista | Elected in 1922. | 1922–1935
Banayoyo, Bauguen, Burgos, Candon, Galimuyod, Lidlidda, Nagbukel, Narvacan, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago |
| 7th | Nacionalista
Consolidado | Re-elected in 1925. |
| 6 | | Fidel B. Villanueva | June 5, 1928 | June 5, 1934 | 8th | Demócrata | Elected in 1928. |
| 9th | Re-elected in 1931. |
| 7 | | Prospero C. Sanidad | June 5, 1934 | September 16, 1935 | 10th | Nacionalista
Democrático | Elected in 1934. |
| # | Member | Term of office | National
Assembly | Party | Electoral history | Constituent
LGUs |
|---|
| Start | End |
|---|
|
| 8 | | Sixto Brillanes Sr. | September 16, 1935 | December 30, 1938 | 1st | Nacionalista
Democrático | Elected in 1935. | 1935–1941
Alilem, Angaki, Banayoyo, Bauguen, Burgos, Candon, Cervantes, Concepcion, Galimuyod, Lidlidda, Nagbukel, Narvacan, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin |
| (7) | | Prospero C. Sanidad | December 30, 1938 | December 30, 1941 | 2nd | Nacionalista | Elected in 1938. |
| District dissolved into the two-seat Ilocos Sur's at-large district for the National Assembly (Second Philippine Republic). |
| # | Member | Term of office | Common
wealth
Congress | Party | Electoral history | Constituent
LGUs |
|---|
| Start | End |
|---|
Ilocos Sur's 2nd district for the House of Representatives of the Commonwealth of the Philippines |
| District re-created May 24, 1945. |
| (7) | | Prospero C. Sanidad | June 11, 1945 | May 25, 1946 | 1st | Nacionalista | Re-elected in 1941. | 1945–1946
Alilem, Angaki, Banayoyo, Bauguen, Burgos, Candon, Cervantes, Concepcion, Galimuyod, Lidlidda, Nagbukel, Narvacan, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin |
| # | Member | Term of office | Congress | Party | Electoral history | Constituent
LGUs |
|---|
| Start | End |
|---|
|
| 9 | | Fidel B. Villanueva | May 25, 1946 | December 30, 1949 | 1st | Liberal | Elected in 1946. | 1946–1957
Alilem, Angaki, Banayoyo, Bauguen, Burgos, Candon, Cervantes, Concepcion, Galimuyod, Lidlidda, Nagbukel, Narvacan, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin |
| 10 | | Ricardo R. Gacula | December 30, 1949 | December 30, 1957 | 2nd | Liberal | Elected in 1949. |
| 3rd | Re-elected in 1953. |
| 11 | | Godofredo S. Reyes | December 30, 1957 | January 25, 1960 | 4th | Nacionalista | Elected in 1957.
Resigned on election as Ilocos Sur governor. | 1957–1965
Alilem, Angaki, Banayoyo, Burgos, Candon, Cervantes, Galimuyod, Gregorio del Pilar, Lidlidda, Nagbukel, Narvacan, Salcedo, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin |
| 12 | | Pablo C. Sanidad | December 30, 1961 | December 30, 1965 | 5th | Liberal | Elected in 1961. |
| January 27, 1969 | December 30, 1969 | 6th | Re-elected in 1965.
Oath of office deferred due to electoral protest. | 1965–1972
Alilem, Banayoyo, Burgos, Candon, Cervantes, Galimuyod, Gregorio del Pilar, Lidlidda, Nagbukel, Narvacan, Quirino, Salcedo, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin |
| 13 | | Lucas V. Cauton | December 30, 1969 | September 23, 1972 | 7th | Nacionalista | Elected in 1969.
Removed from officer after imposition of martial law. |
| District dissolved into the twelve-seat Region I's at-large district for the Interim Batasang Pambansa, followed by the two-seat Ilocos Sur's at-large district for the Regular Batasang Pambansa. |
| District re-created February 2, 1987. |
| 14 | | Eric D. Singson | June 30, 1987 | June 30, 1998 | 8th | KBL | Elected in 1987. | 1987–present
Alilem, Banayoyo, Burgos, Candon, Cervantes, Galimuyod, Gregorio del Pilar, Lidlidda, Nagbukel, Narvacan, Quirino, Salcedo, San Emilio, San Esteban, Santa, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Sigay, Sugpon, Suyo, Tagudin. |
| 9th | LDP | Re-elected in 1992. |
| 10th | Re-elected in 1995. |
| 15 | | Grace G. Singson | June 30, 1998 | June 30, 2001 | 11th | LDP | Elected in 1998. |
| (14) | | Eric D. Singson | June 30, 2001 | June 30, 2010 | 12th | Lakas | Elected in 2001. |
| 13th | Re-elected in 2004. |
| 14th | Re-elected in 2007. |
| 16 | | Eric G. Singson Jr. | June 30, 2010 | June 30, 2013 | 15th | Liberal | Elected in 2010. |
| (14) | | Eric D. Singson | June 30, 2013 | June 30, 2019 | 16th | Liberal | Elected in 2013. |
| 17th | Bileg | Re-elected in 2016. |
| 17 | | Kristine Singson-Meehan | June 30, 2019 | Incumbent | 18th | Bileg | Elected in 2019. |
| 19th | NPC | Re-elected in 2022. |
