|County||Contra Costa County|
|Elevation||709 ft (216 m)|
Tassajara (until 1959, Tassajero; also formerly called Tasajero and Tassajera) is an unincorporated community in Contra Costa County, California. It is located on the east bank of Tassajara Creek, 6.5 miles (10 km) south-southeast of Mount Diablo, at an elevation of 709 feet (216 m). Together with Blackhawk it forms the Blackhawk-Camino Tassajara CDP.
A post office operated at Tassajara from 1896 to 1922.
- U.S. Geological Survey Geographic Names Information System: Tassajara, California
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 711. ISBN 9781884995149.
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