Legislative districts of the Philippines
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The Legislative districts of the Philippines are the division are the representations of the Philippines' provinces and cities in the House of Representatives. The first composition of legislative districts were enshrined in the Ordinance appended to the Constitution. Changes in the composition of legislative districts were later on added as new provinces and cities were created, and the composition were modified through laws enacted by Congress.
Representation to the legislature traces its origin during the Spanish era, when the Philippines was granted very limited representation to the Spanish Cortes. During the American period, when the Philippine Bill of 1092 was enacted, the first Philippine Assembly was established as the lower house and the then-existing Philippine Commission as the upper house. Representation in the assembly was apportioned among the provinces with respect to their population, provided that no province shall have less than one member.
In 1916, the Philippine Legislature was reconstituted with a Senate as the upper house and the Assembly retained as the lower house. The Senate elected members through Senatorial Districts, a grouping of provinces and areas of the country, while the Assembly retained its way of representation. During the Commonwealth period, the Philippine Legislature was abolished, and a unicameral National Assembly was established, with representation being like that of the Philippine Assembly - each province shall have at least one member depending on its population.
With the passage of the 1940 Amendments to the 1935 Constitution, a bicameral Congress was established with a House of Representatives and a Senate. The House of Representatives way of representation was like that of the Philippine Assembly, while the Senate's members were elected at large.
With the coming of the Interim Batasang Pambansa and the regular Batasan during the Marcos regime, representation was done in many ways: most members were elected by regions, some by appointment from the different sectors of the society such as youth and labor, and some were members of the Cabinet appointed by the President. However, with the advent of the 1987 Constitution, the Batasan was scrapped and the Congress was restored. The present way of electing delegates to the House of Representatives is through legislative districts apportioned among the provinces, cities and the Metropolitan Manila Area and through a party-list system of registered national, regional and sectoral parties or organizations.
Senatorial districts 
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Politics and government of
From 1916 to 1935, the Philippines was divided into 12 senatorial districts. Each district, except for the twelfth senatorial district elect two senators to the Senate. The senators from 12th senatorial district were appointed by the U.S. Governor-General. Since 1941, when the Senate was restored all twenty-four senators were elected at-large in intervals.
|Senatorial District||Provinces and/or City|
|First District||Abra (re-established 1917), Batanes, Cagayan, Ilocos Norte, Ilocos Sur, Isabela|
|Second District||La Union, Pangasinan, Zambales|
|Third District||Bulacan, Nueva Ecija, Pampanga, Tarlac|
|Fourth District||City of Manila, Bataan, Laguna, Rizal|
|Fifth District||Batangas, Cavite, Marinduque (established 1920), Mindoro, Tayabas|
|Sixth District||Albay, Ambos Camarines (split into Norte and Sur 1917), Sorsogon|
|Seventh District||Capiz, Iloilo, Romblon (established 1917)|
|Eighth District||Antique, Negros Occidental, Negros Oriental, Palawan|
|Ninth District||Leyte, Samar|
|Eleventh District||Bohol, Misamis (split into Occidental and Oriental 1929), Surigao|
|Twelfth District||City of Baguio, Department of Mindanao and Sulu (abolished in 1920, consisted of the provinces of Agusan, Bukidnon, Davao, Lanao, Sulu and Zamboanga), Mountain Province (consisted of the sub-provinces of Apayao, Benguet, Bontoc, Ifugao, and Kalinga), Nueva Vizcaya|
Representative districts