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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. San Ramon, California - Wikipedia

    en.wikipedia.org/wiki/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 Concord , Richmond and ...

  5. Castle Rock Regional Recreational Area - Wikipedia

    en.wikipedia.org/wiki/Castle_Rock_Regional...

    Coordinates. 37°53′6″N 121°59′29″W. /  37.88500°N 121.99139°W  / 37.88500; -121.99139. Area. 18,000 acres (73 km 2) Governing body. East Bay Regional Park District. Castle Rock Regional Recreation Area is a 18,000 acres (73 km 2) regional park of the East Bay Regional Park District. It is located in Contra Costa County, in the ...

  6. 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.

  7. 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.