Many famous people are associated with these Contra Costa County historic places including John Muir, Eugene O'Neill, John Marsh, Paul DeMartini, Alice Tisdale Hobart and Charles Washington Merill.
Some of the country's most noteable architects helped create the Contra Costa County places including Wolfe & Son, Permenenta Metals Corp., Unkown, Frederick Confer, Richmond Shipyard No. 1, Carl I. Warnecke, Mory Wortman, Vicente Martinez, Anor Larson and Andrew T. Hass. Prominent architectural styles found in Contra Costa Country are Italianate, Classical Revival and Queen Anne.