Region IV-B (MIMAROPA)

PSGC: 170000000
ISO: 04
Regional Centre: Calapan, City of
Congressional Districts: 7
Provinces: 5
Cities: 2
Municipalities: 71
Barangays: 1,458

May 17, 2002: Region IV-B (MIMAROPA) created from Marinduque, Occidental Mindoro, Oriental Mindoro, Palawan, and Romblon from Region IV (Southern Tagalog) with Quezon City as the regional centre, by Executive Order No. 103.
May 23, 2005: Palawan transferred to Region VI (Western Visayas) by Executive Order No. 429 but transfer put on hold by Administrative Order No. 129.
November 22, 2007: Calapan, City of, designated as the regional centre by Executive Order No. 682.

PSGC: 174000000
ISO: MAD
Province Capital: Boac
Area Code: 42
Congressional Districts: 1
Cities: 0
Municipalities: 6
Barangays: 218

1590: Established as a sub-district of Mindoro.
1671: Became a province but later reduced to a sub-province of Mindoro.
April 28, 1898: Marinduque proclaimed a province from Mindoro
May 1, 1901: Established as a province by Act No. 125.
June 23, 1902: Mindoro annexed by Act No. 423.
November 10, 1902: Became a sub-province of Tayabas by Act No. 499.
March 10, 1917: Established by Act No. 2711.
February 21, 1920: Restored as a province by Act No. 2880.

PSGC: 175100000
ISO: MDC
Province Capital: Mamburao
Area Code: 43
Congressional Districts: 1
Cities: 0
Municipalities: 11
Barangays: 162

June 13, 1950: Occidental Mindoro province created from Mindoro by Republic Act No. 505.

PSGC: 175200000
ISO: MDR
Province Capital: Calapan, City of
Area Code: 43
Congressional Districts: 2
Cities: 1
Municipalities: 14
Barangays: 426

Early 17th Century: Mindoro created as a district from Batangas.
June 23, 1902: Became a sub-province of Marinduque by Act No. 423.
November 1902: Became a special province.
March 10, 1917: Established by Act No. 2711.
February 20, 1921: Mindoro restored as a province by Act No. 2964.
June 13, 1950: Oriental Mindoro province created from Mindoro by Republic Act No. 505.

PSGC: 175300000
ISO: PLW
Province Capital: Puerto Princesa City
Area Code: 48
Congressional Districts: 2
Cities: 1
Municipalities: 23
Barangays: 433

1705: Palawan ceded to the Philippines by the Sultan of Sulu.
1749: Territory ceded to the Philippines by the Sultan of Brunei.
1818: Calamianes province created.
1858 - 1859: Calamianes province divided into the two sub-provinces of Asturias and Castilla. Later divided into the three districts of Balabac, Calamianes and Paragua.
1902: Paragua province created.
1903: Paragua reorganised and renamed Palawan by Act No. 1363.
March 10, 1917: Province established by Act No. 2711.

PSGC: 175900000
ISO: ROM
Province Capital: Romblon
Area Code: 42
Congressional Districts: 1
Cities: 0
Municipalities: 17
Barangays: 219

1635: Romblon created as province.
1818: Annexed by Capiz.
1853: Created as a district of Capiz.
March 16, 1901: Became a province.
1907: Reduced to a sub-province of Capiz.
March 10, 1917: Province established by Act No. 2711.
1946: Became a sub-province of Capiz.
January 1, 1947: Romblon restored as a province by Republic Act No. 38.