Half Moon Bay is a coastal city in San Mateo County, California, USA. Immediately at the north of Half Moon Bay is the Pillar Point Harbor and the unincorporated community of Princeton-by-the-Sea. It is situated on a bay of the same name. Major local industries include agriculture (houseplants, floriculture, Christmas trees, pumpkins, artichokes), fishing, and tourism. Historically, Half Moon Bay had been known as San Benito and Spanishtown.