Raised Relief Map of Contra Costa County

Contra Costa County 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. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. The county's name refers to its p…
Contra Costa County 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. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. The county's name refers to its position on the other side of the bay from San Francisco. Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.
  • Country: United States
  • State: California
  • Region: San Francisco Bay Area
  • Incorporated: February 18, 1850
  • Named for: "Opposite coast" (Spanish: Contra costa) of the San Francisco Bay
  • County seat: Martinez
  • Largest city: Concord (population and land area) · Richmond (total area)

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Data from: en.wikipedia.org