Contra Costa County is in San Francisco Bay Area California. Of the 58 counties in the Golden State, Contra Costa County ranks 50th in terms of size (514,601 acres). Recent listings of residential land and property for sale in California's Contra Costa County totals around 1,000 acres and a combined market value of nearly $144 million. By overall acreage, residential property is the most common type of land for sale in Contra Costa County. The average price of residential acreage for sale in Contra Costa County was $3 million. Browse all residential land and rural property for sale in California to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.