|County||Contra Costa County|
|Elevation||39 ft (12 m)|
Cornwall (formerly, Cornwall Station) was an unincorporated community in Contra Costa County, California, before it was absorbed into the City of Pittsburg. It was located 7.25 miles (11.67 km) east-southeast of Baypoint and 1 mile (1.6 km) south of downtown Pittsburg, at an elevation of 39 feet (12 m) ASL.
The area appears to have been named after Pierre Barlow Cornwall who was an early California pioneer and president of the Black Diamond Coal Mining Company at nearby Nortonville, California from 1872 to 1904. Cornwall sprung up at the intersection of two railroads, the Black Diamond Coal Mining Railroad and the San Pablo and Tulare Railroad, (the latter became part of the Southern Pacific system in 1888). The coal railroad crossed the San Pablo and Tulare line using an overhead trestle.
The Cornwall area, together with the nearby town of Black Diamond, was officially renamed "Pittsburg" on February 11, 1911, which may explain why the Cornwall Post Office stopped operations in that same year.
- U.S. Geological Survey Geographic Names Information System: Cornwall, California
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 681. ISBN 9781884995149.
- Bruce Cornwall, "Life Sketch of Pierre Barlow Cornwall," (1906), pp. 60 and 82.
- The Pacific Tourist, J. R. Bowman, Publisher, 1882, p. 335.
Pierre Barlow Cornwall, 1821-1904
Life Sketch of Pierre Barlow Cornwall, written by his son Bruce Cornwall, 1906
Black Diamond Mines Regional Preserve, part of the East Bay Park District
- Pierre Barlow Cornwall, 1821-1904
- Life Sketch of Pierre Barlow Cornwall, written by his son Bruce Cornwall, 1906
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