Unlike other administrative regions in the Philippines, Metro Manila is not composed ofprovinces. Instead, the region is divided into four geographic areas called "districts." The districts have their district centers at the four original cities in the region: the city-district of Manila, Quezon City, Caloocan, and Pasay. The districts serve mainly to organize the region's local government units for fiscal and statistical purposes.
Independent cities and municipality
The seventeen local government units of Metro Manila are administratively equal to provinces. They are composed of sixteen independent cities, classified as highly urbanized cities, and one independent municipality: Pateros.
The cities and municipality of Metro Manila are divided into barangays with populations ranging from under 1,000 to over 200,000. In the City of Manila, Caloocan and Pasay, the barangays are grouped into zones for strategical purposes. As of 2015, there are 1,710 barangays in Metro Manila.
Other divisions
Congressional districts
In terms of congressional representation, the region has 32 congressional districts with each city comprising one or more districts. The lone municipality of Pateros shares a congressional district with the first district of Taguig.
Old districts
Metro Manila cities may also be divided into traditional districts, such as the former municipalities that make up the City of Manila and the historical municipalities and estates like Novaliches, Balintawak, San Francisco del Monte and Diliman that were amalgamated to form Quezon City. Neither division has its own government. In Pasay, traditional districts include Malibay, Santa Clara, San Rafael and Maricaban.
Gated communities
Some cities in Metro Manila may also be divided into several gated communities, also known as subdivisions, which may or may not constitute their own barangays or low-level local government units. Some examples are: Dasmariñas Village in Makati; Ayala Alabang in Muntinlupa; Marina Bay, Merville, Tahanan Village and Better Living Subdivision in Parañaque; La Vista, White Plains, BF Homes, Greenmeadows and Filinvest Homes in Quezon City.
Historical divisions
Before 1901
Before 1901, the Province of Manila which today encompasses most of Metro Manila and the northern part of the neighboring province of Rizal was divided into 24 municipalities with Intramuros as its capital.
1901–1942
Except for the City of Manila which amalgamated six smaller municipalities in June 1901, the Province of Manila was absorbed by the newly created Province of Rizal with Pasig as its provincial capital.
1942–1947
The City of Greater Manila was formed in January 1942 combining the City of Manila and Quezon City, as well as six other municipalities from Rizal: Caloocan, Makati, Mandaluyong, Parañaque, Pasay and San Juan.
1947–1975
The seven municipalities of the City of Greater Manila were restored and reorganized under the Province of Rizal. In November 1975 through Presidential Decree No. 824, Metropolitan Manila was created out of four cities and thirteen municipalities which covers the present-day territory of Metro Manila. It was declared the National CapitalRegion of the Philippines in June 1978.