The use of ZIP codes in the Philippines is not mandatory, however it is highly recommended by Philippines post that they be used. Also, unlike American ZIP codes, the Philippine code is a four-digit number representing two things: in Metro Manila, a barangay within a city or city district (as in the case for Manila), and outside Metro Manila, a town or city. Usually, more than one code is issued for areas within Metro Manila, and provincial areas are issued one code for every town and city

*Abra
*Agusan del Norte
*Agusan del Sur
*Aklan
*Albay
*Antique
*Apayao
*Aurora
*Basilan
*Bataan
*Batanes
*Batangas
*Benguet
*Biliran
*Bohol
*Bukidnon
*Bulacan
*Cagayan
*Camarines Norte
*Camarines Sur
*Camiguin
*Capiz
*Catanduanes
*Cavite
*Cebu
*Compostela Valley
*Cotabato
*Davao del Norte
*Davao del Sur
*Dinagat Islands
*Eastern Samar
*Guimaras
*Ifugao
*Ilocos Norte
*Ilocos Sur
*Iloilo
*Isabela
*Kalinga
*La Union
*Laguna
*Lanao del Norte
*Lanao del Sur
*Leyte
*Maguindanao
*Marinduque
*Masbate
*Metro Manilao
*Misamis Occidental
*Misamis Oriental
*Mountain Province
*Negros Occidental
*Negros Oriental
*Northern Samar
*Nueva Ecija
*Nueva Vizcaya
*Occidental Mindoro
*Oriental Mindoro
*Palawan
*Pampanga
*Pangasinan
*Quezon
*Quirino
*Rizal
*Romblon
*Sarangani
*Shariff Kabunsuan
*Siquijor
*Sorsogon
*South Cotabato
*Southern Leyte
*Sultan Kudarat
*Sulu
*Surigao del Norte
*Surigao del Sur
*Tarlac
*Western Samar
*Zambales
*Zamboanga del Norte
*Zamboanga del Sur
*Zamboanga Sibugay