Contra Costa County on the map of California 2025. Cities, roads, borders and directions in Contra Costa County of California.
USA / California / Contra Costa CountyContra Costa County is one of the most populous counties in California, home to 1.05 million people. Its name means "Opposite Coast" in Spanish, which reflects its position to San Francisco. The total area of Contra Costa County is 804 square miles, the county seat is Martinez and the largest city is Concord. This map shows the borders of Contra Costa County as well as neighboring counties, including major highways and natural objecsts as of 2025. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of Contra Costa County.
The borders of Contra Costa County over the map of California
Explore some more counties of California:
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