Zip Code / Postal Code of Olongapo City, Zambales

Olongapo ([ʔoˌloːŋ.ɡɐˈpo]), officially the City of Olongapo (Filipino: Lungsod ng Olongapo; Ilocano: Siudad ti Olongapo; Sambal: Siyodad nin Olongapo; Kapampangan: Lakanbalen/Ciudad ning Olongapo), is a 1st class highly urbanized city in the Central Luzon region of the Philippines. According to the 2020 census, it has a population of 260,317 people. It is geographically situated and grouped under the province of Zambales by the Philippine Statistics Authority but governed independently from the province and it is also the largest city. Portions of the city also form part of the Subic Special Economic and Freeport Zone. Along with the municipality of Subic, it comprises Metro Olongapo, one of the twelve metropolitan areas in the Philippines.
Source: Wikipedia