Tassajara, California

Tassajara, a variation of the Spanish word "tasajera", is an unincorporated community in Contra Costa County, California, United States. It is located on the east bank of Tassajara Creek, south-southeast of Mount Diablo, at an elevation of 709 feet. Together with Blackhawk it forms the Blackhawk-Camino Tassajara census designated place.

History

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

Census county division

Tassajara is also the name of the wider unincorporated census county division located on the eastern side of Mount Diablo in central Contra Costa County, California. The area covers approximately, much of it open space, and contains the southern portion of Mount Diablo State Park, the Black Diamond Mines, Morgan Territory, Round Valley and Vasco Caves regional preserves, as well as the Los Vaqueros reservoir.