Pittsburg (formerly, Black Diamond, City of New York of the Pacific, New York of the Pacific, and Pittsburgh) is a city located in eastern Contra Costa County, California, the outer portion of the East Bay region of the San Francisco Bay Area. It has one BART station, the Pittsburg/Bay Point Station located in Bay Point. The current zip code is 94565 for both Pittsburg and Bay Point, and the area code is 925.