40
Percentage of all wine production in California attributable to E & J Gallo Winery. The Modesto-based company owns 24,000 acres of land, its own glass manufacturing plant, and 80 different wine brands worldwide, including Orin Swift, Louis M. Martini, and Barefoot Cellars. Brothers Ernest and Julio Gallo founded the winery in 1933. Gallo has been the largest winery in the U.S. since 1966 and is currently the largest family-owned winery in the world.