Contra Costa County California (Historic Districts) has 14 places on the National Register of Historic Places including 3 places of National significance and 5 places of Statewide significance. Significant places include Atchison Village Defense Housing Project, Cal. 4171-x, East Brother Island Light Station, Richmond Shipyard Number Three, Black Diamond Mines and Ford Motor Company Assembly Plant.
Some of the country's most noteable architects helped create the Contra Costa County places including Andrew T. Hass, Mory Wortman, Carl I. Warnecke, Unkown, Anor Larson, Albert Kahn, William S. & Son Mosser, Rider & Connor, Edward A. Hoffman and Havens & Topeke. Prominent architectural styles found in Contra Costa Country are Italianate, Queen Anne and Beaux Arts.