In the Philippines, a ZIP code is used by the Philippine Postal Corporation (PhlPost) to simplify the distribution of mail.^[1] While its function similar with the ZIP Codes used in the United States, its form and usage are quite different. Its use is not mandatory but highly recommended by the PhlPost. A ZIP code is composed of a four-digit number representing a locality. Usually, more than one code is issued for areas within Metro Manila, and a single code for each municipality and each city in provinces, with exceptions such as:^[1]

• Davao City with 11 ZIP codes (8000, 8016 to 8026);
• Antipolo with 6 ZIP codes (1870 to 1875);
• Calamba (Laguna), Cavite City, Dasmariñas, Mabalacat, Mariveles, and the Island Garden City of Samal with 3 ZIP codes each;^[2] and
• Angeles City, Bacoor, Baguio, Bamban, Biñan, Capas, Floridablanca, General Tinio, Labo, Laur, Limay, Lipa, Los Baños, Lubao, Lucena, Majayjay, Muñoz, Palayan, Porac, Puerto Princesa, Sagay, San Jose del Monte, San Rafael (Bulacan), Santa Rosa (Laguna), Santa Rosa (Nueva Ecija), Silay, Sorsogon City, and Tagbina with 2 ZIP codes each.