Napa (năpˈə) [key], city (1990 pop. 61,842), seat of Napa co., W Calif., on the Napa River; inc. 1872. There are wineries and factories that produce medical and electronic equipment, beverages, apparel, and plastic and wood products. Grapes and other fruits (especially citrus fruit) are grown in the adjacent Napa Valley, which lies northwest between two mountain ranges and is famous for the wines that have been made there since the late 1870s. Numerous wineries are located in the region, drawing tourists to the towns of Yountville, Oakville, St. Helena, and Calistoga.