Situated at the Southern entry point of Zambales and the Northwestern interior of the Subic Bay area, Olongapo City approximately 127 kilometers North of Manila. It's total land area of 18,500 hectares is distributed among 17 barangays.

the Zambales mountains on its three sides, Bataan and Subic Bay at its base - development of city land is limited. Also, the territorial borders from nearby towns are not properly marked.

The population of Olongapo City is more than 310,000 and is projected to increase to 453,894 by the year 2000. This rapid growth is attributed to the heavy influx of migrants from neighboring towns and other parts of the country, attracted by the booming industry and employment opportunites offered by Olongapo City, through the Subic Bay Freeport.

There are no main dialects in Olongapo City. The people generally speak and understand Filipino and English.