Tassajara, a variation of the Spanish word "tasajera" (Spanish for "place where the meat is hung" or "meat drier"),Museum of San Ramon Valley - Tassajara is an unincorporated community in Contra Costa County, California, United States. It is located on the eastern bank of Tassajara Creek, 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.
Census county division Tassajara is also the name of the wider unincorporated census county division (CCD) located on the eastern side of Mount Diablo in central Contra Costa County, California.Tassajara CCD, Map and Demographics, United States Census Bureau The area covers approximately , much of it open space,Open Space / Contra Costa County and East Bay Regional Park District Liaison Committee 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.
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