Tassajara, a variation of the Spanish word "tasajera" (Spanish for "place where the meat is hung" or "meat drier"), is an unincorporated community in Contra Costa County, California, United States. It is located on the east bank of Tassajara Creek, 6.5 mi south-southeast of Mount Diablo, at an elevation of 709 feet (216 m). Together with Blackhawk it forms the Blackhawk-Camino Tassajara census designated place (CDP).

History

Until 1959, it was known as Tassajero;. A post office operated at Tassajara from 1896 to 1922.