Zinfandel (formerly Bell Station and Pine Station) is a small unincorporated community in Napa County, California just south of the city of St. Helena in the North Bay region of the San Francisco Bay Area. It is part of the Wine Country. It is located at the intersection of the St. Helena Highway (State Route 29) and Zinfandel Lane and comprises about 14 square blocks, most of which are rural and residential in character. The ZIP Code is 94574. The community is inside area code 707. The town was named after the Zinfandel grape and a variety of wine produced from that grape.