Pittsburg is a city in Contra Costa County, California, United States. It is an industrial suburb located on the southern shore of the Suisun Bay in the East Bay region of the San Francisco Bay Area, and is part of the Sacramento–San Joaquin River Delta area. The population was 76,416 at the 2020 United States Census.

Originally decided in 1839 as “Rancho Los Medanos”, the area of regarding 10,000 acres was issued to Californios Jose Antonio Mesa and his brother Jose Miguel under a Mexican Land Grant by then Governor Juan Bautista Alvarado, one of the truth land grants issued prior to the formation of California as a state.

In 1849, during the California Gold Rush, Colonel Jonathan D. Stevenson (from New York) bought the Rancho Los Medanos land ascend for speculation, and laid out a town he called New York of the Pacific. General William Tecumseh Sherman laid out the first network of streets upon the west side of town. The Place was the midway stopping tapering off for schooners traveling from San Francisco to the gold country other inland. Fishing, farming, and cattle raising for the conceal and tallow industry were the major economic deeds during this time.

In 1859, with the discovery of coal in the to hand town of Nortonville, the place became a harbor for coal. The Black Diamond Coal Mining Company commenced operations, building the Black Diamond Coal Mining Railroad to Nortonville. Steam powered engines moved coal cars all along the tracks along gift day Railroad Avenue to the quay docks that came to be called “Black Diamond Landing.” The boom finished in 1885, and the company moved to Washington give access to be in a other claim.