In point of area, Botolan is the largest town with 61,370 hectares followed by San Marcelino, Candelaria, and Sta. Cruz in that order. The province has 222 barrios. These mining companies are engaged in mining metallurgical and refractory chromite and export them to Japan and the United States. Zambales is predominantly an agricultural province.
Chief products are rice, corn, vegetables, and rootcrops.
Major industries include farming, fishing and mining. Points of interest Subic Naval Base. Once a huge naval complex of the US Naval Station and the largest support base maintained by the US Navy in the Pacific. Its mission was to provide support services to operating units of the US 7th Fleet. Subic Bay, a deep natural volcanic harbor has been a United States Naval Base for over three quarters of a century.