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  2. Contra Costa County, California - Wikipedia

    en.wikipedia.org/wiki/Contra_Costa_County...

    Website. contracosta.ca.gov. Contra Costa County (/ ˌkɒntrə ˈkɒstə / ⓘ; Contra Costa, Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States Census, the population was 1,165,927. [6]

  3. Black Diamond Mines Regional Preserve - Wikipedia

    en.wikipedia.org/wiki/Black_Diamond_Mines...

    The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973. The preserve contains relics of 3 mining towns, former coal and sand mines, and offers ...

  4. East Bay Regional Park District - Wikipedia

    en.wikipedia.org/wiki/East_Bay_Regional_Park...

    124,909 acres (50,549 ha) Created. 1934. Website. www.ebparks.org. The East Bay Regional Park District (EBRPD) is a special district operating in Alameda County and Contra Costa County, California, within the East Bay area of the San Francisco Bay Area. It maintains and operates a system of regional parks which is the largest urban regional ...

  5. Black Diamond Coal Mining Company - Wikipedia

    en.wikipedia.org/wiki/Black_Diamond_Coal_Mining...

    California, Washington. The Black Diamond Coal Mining Company was formed in 1861, consolidating the Cumberland and Black Diamond coal mines in the region of Mount Diablo, in Contra Costa County, California. [1] During its years of operation as a mining company, it established three towns: Nortonville, California, Southport, Oregon, and Black ...

  6. Brentwood, California - Wikipedia

    en.wikipedia.org/wiki/Brentwood,_California

    Brentwood is a city in Contra Costa County, California, United States. It is located in the East Bay region of the San Francisco Bay Area. The population is 66,854 as of 2022, an increase of 287% from 23,302 at the 2000 census. [7] Brentwood was settled by Euro-Americans in the late 19th century. The community is still known throughout the Bay ...

  7. San Ramon, California - Wikipedia

    en.wikipedia.org/wiki/San_Ramon,_California

    San Ramon, California. San Ramon (Spanish: San Ramón, meaning "Saint Raymond") is a city in Contra Costa County, California, United States, located within the San Ramon Valley, and 34 miles (55 km) east of San Francisco. San Ramon's population was 84,605 per the 2020 census, [9] making it the 4th largest city in Contra Costa County, behind ...

  8. National Register of Historic Places listings in Contra Costa ...

    en.wikipedia.org/wiki/National_Register_of...

    1005 Escobar St. 38°01′09″N 122°08′05″W. /  38.0191°N 122.1347°W  / 38.0191; -122.1347  ( Borland House) Martinez. First property listed under the Multiple Property Submission "Historic Resources of Martinez, California" also accepted to the National Register of Historic Places April 2015.

  9. Martinez, California - Wikipedia

    en.wikipedia.org/wiki/Martinez,_California

    Martinez, California. Martinez (Spanish: Martínez) [9][10] is a city and the county seat of Contra Costa County, California, United States, in the East Bay region of the San Francisco Bay Area. [11] Located on the southern shore of the Carquinez Strait, the city's population was 37,287 at the 2020 census.