In the northern part of the county, significant coal and sand deposits were formed in even earlier geologic eras. In prehistoric times, particularly the Miocene epoch, portions of the landforms now in the area (then marshy and grassy savanna) were populated by a wide range of now extinct mammals, known in modern times by the fossil remains excavated in the southern part of the county. Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area. The county's name refers to its position on the other side of the bay from San Francisco. ![]() It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. As of the 2020 United States Census, the population was 1,165,927. ![]() state of California, in the East Bay of the San Francisco Bay Area. Contra Costa County ( / ˌ k ɒ n t r ə ˈ k ɒ s t ə/ ( listen) Contra Costa, Spanish for "Opposite Coast") is a county located in the U.S.
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