| Tassajara | |
|---|---|
| — Unincorporated community — | |
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Tassajara
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| Coordinates: | |
| Country | United States |
| State | California |
| County | Contra Costa County |
| Elevation[1] | 709 ft (216 m) |
Tassajara (until 1959, Tassajero;[1] also formerly called Tasajero and Tassajera[2]) 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,[2] at an elevation of 709 feet (216 m). Together with Blackhawk ist forms the Blackhawk-Camino Tassajara CDP.
A post office operated at Tassajara from 1896 to 1922.[2]