# Sub-provinces of the Philippines

The sub-provinces of the Philippines were a political and administrative division of the Philippines. The sub-provinces were a part of a larger "regular" province and residents of a sub-province participated in provincial elections of the parent province.

## List of historical sub-provinces

| Sub-province | Parent province | Established | Disestablished | Fate |
| Abra | Ilocos Sur | April 1, 1905 | March 9, 1917 | Already recognized as a regular province in 1901 (Act No. 206). Annexed to Ilocos Sur as a sub-province in 1905 (Act No. 1306). Became a regular province again in 1917 (Act No. 2683). |
| Amburayan | Lepanto-Bontoc (1902–1908) Mountain Province (1908–1920) | May 28, 1902 | February 4, 1920 | Territory organized as a sub-province of Lepanto-Bontoc in 1902 (Act No. 410). Transferred to newly created Mountain Province upon abolition of Lepanto-Bontoc in 1908 (Act No. 1876). Most of territory annexed to Ilocos Sur and La Union in 1917 (Act No. 2711). Abolished in 1920 when its remaining territory was annexed to the sub-province of Benguet in the Mountain Province (Act No. 2877). |
| Apayao | Cagayan (1907–1908) Mountain Province (1908–1966) Kalinga-Apayao (1966–1995) | May 9, 1907 | May 8, 1995 | Territory organized as a sub-province of Cagayan in 1907 (Act No. 1642). Transferred to newly created Mountain Province in 1908 (Act No. 1876). Transferred to newly created Kalinga-Apayao province in 1966 (Republic Act No. 4695). Became a regular province in 1995 (Republic Act No. 7878). |
| Aurora | Quezon | June 14, 1951 | August 13, 1979 | Established as a sub-province of Quezon in 1951 (Republic Act No. 648). Became a regular province in 1979 upon proclamation of result of plebiscite ratifying Batas Pambansa Blg. 7. |
| Batanes | Cagayan | August 20, 1907 | May 20, 1909 | Spanish-era province abolished and territory annexed to Cagayan in 1901 (Act No. 209). Organized as a sub-province of Cagayan in 1907 (Act No. 1693). Became a province again in 1909 (Act No. 1952). |
| Benguet | Mountain Province | August 18, 1908 | June 18, 1966 | Already recognized as a regular province in 1900 (Act No. 49). Annexed to newly created Mountain Province in 1908 (Act No. 1876). Became a regular province again in 1966 (Republic Act No. 4695). |
| Biliran | Leyte | April 8, 1959 | May 11, 1992 | Established as a sub-province of Leyte in 1959 (Republic Act No. 2141). Became a regular province in 1992 upon ratification of Section 462 of Republic Act No. 7160. |
| Bontoc | Lepanto-Bontoc (1902–1908) Mountain Province (1908–1966) | May 28, 1902 | June 18, 1966 | Territory organized as a sub-province of Lepanto-Bontoc in 1902 (Act No. 410). Transferred to newly created Mountain Province upon abolition of Lepanto-Bontoc in 1908 (Act No. 1876). Became a regular province and assumed the name Mountain Province upon separation of other component sub-provinces in 1966 (Republic Act No. 4695). |
| Bukidnon | Agusan | August 20, 1907 | September 1, 1914 | Territory organized as a sub-province of Agusan in 1907 (Act No. 1693). Agusan Province (composed of Bukidnon and Butuan sub-provinces) placed under the Department of Mindanao and Sulu in 1913 (Act No. 2309). Separated from Butuan sub-province and became a province within the Department of Mindanao and Sulu in 1914 (Act No. 2408). |
| Butuan | Agusan | August 20, 1907 | September 1, 1914 | Territory organized as a sub-province of Agusan in 1907 (Act No. 1693). Agusan Province (composed of Bukidnon and Butuan sub-provinces) placed under the Department of Mindanao and Sulu in 1913 (Act No. 2309). Separated from Bukidnon and became a province within the Department of Mindanao and Sulu under the name Agusan in 1914 (Act No. 2408). |
| Camiguin | Misamis Oriental | June 22, 1956 | June 18, 1966 | Established as a sub-province of Misamis Oriental in 1956 (Republic Act No. 2021). Became a regular province in 1966 (Republic Act No. 4669). |
| Catanduanes | Albay | April 19, 1905 | October 26, 1945 | Established as a sub-province of Albay in 1905 (Act No. 1331). Became a regular province in 1945 (Commonwealth Act No. 687). |
| Guimaras | Iloilo | June 18, 1966 | May 11, 1992 | Established as a sub-province of Iloilo in 1966 (Republic Act No. 4667). Became a regular province in 1992 upon ratification of Section 462 of Republic Act No. 7160. |
| Ifugao | Mountain Province | August 18, 1908 | June 18, 1966 | Territory annexed from northwestern area of Nueva Vizcaya organized as a sub-province of the newly created Mountain Province in 1908 (Act No. 1876). Became a regular province in 1966 (Republic Act No. 4695). |
| Kalinga | Lepanto-Bontoc (1907–1908) Mountain Province (1908–1966) Kalinga-Apayao (1966–1995) | May 9, 1907 | May 8, 1995 | Territory organized as a sub-province of Lepanto-Bontoc in 1907 (Act No. 1642). Transferred to newly created Mountain Province upon abolition of Lepanto-Bontoc in 1908 (Act No. 1876). Transferred to newly created Kalinga-Apayao province in 1966 (Republic Act No. 4695). Became a regular province in 1995 (Republic Act No. 7878). |
| Lepanto | Lepanto-Bontoc (1907–1908) Mountain Province (1908–1920) | May 28, 1902 | February 4, 1920 | Territory organized as a sub-province of Lepanto-Bontoc in 1902 (Act No. 410). Transferred to newly created Mountain Province upon abolition of Lepanto-Bontoc in 1908 (Act No. 1876). Abolished in 1920 when its territory was annexed to Ilocos Sur and the sub-province of Bontoc in the Mountain Province (Act No. 2877). |
| Marinduque | Tayabas | August 10, 1907 | November 21, 1920 | Already recognized as a province in 1901 (Act No. 125). Province abolished and territory annexed to Tayabas in 1902 (Act No. 499). Established as a sub-province in 1907 (Act No. 1649). Became a regular province again in 1920 (Act No. 2880). |
| Masbate | Sorsogon | January 1, 1906 | December 15, 1920 | Already recognized as a province in 1901 (Act No. 105). Annexed to Sorsogon as a sub-province in 1906 (Act No. 1413). Became a regular province again in 1920 (Act No. 2934). |
| Quirino | Nueva Vizcaya | June 18, 1966 | November 11, 1971 | Established as a sub-province of Nueva Vizcaya in 1966 (Republic Act No. 4734). Became a regular province upon ratification of Republic Act No. 6394 in 1971. |
| Romblon | Capiz | July 15, 1907 | December 7, 1917 | Already recognized as a province in 1901 (Act No. 104). Annexed to Capiz as a sub-province in 1907 (Act No. 1665). Became a regular province again in 1917 (Act No. 2724). |
| Siquijor | Negros Oriental | October 8, 1907 | November 11, 1971 | Established as a sub-province of Negros Oriental in 1907 (Act No. 1753). Became a regular province upon ratification of Republic Act No. 6398 in 1971. |