Of 58 counties in the Land of Milk and Honey, Contra Costa County ranks 50th in terms of size (804 square miles). Contra Costa County is in San Francisco Bay Area California. There is around 1,000 acres of riverfront homes and property for sale in Contra Costa County, California, based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here is approximately $400,000. Browse all waterfront property for sale in Contra Costa County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Contra Costa County is residential property.