Yountville is an incorporated town in Napa County, California, United States. It is part of the Napa, California Metropolitan Statistical Area. Its area code 707. Its zipcode is 94599. It is in the Pacific time zone (GMT -8). The population was 2,916 at the 2000 census. The town's name is derived from the name of early pioneer George Calvert Yount. Yount was considered responsible for establishing the first vineyard in the Napa Valley. Yountville is now a renowned destination in the heart of the Napa Valley wine country with world famous restaurants and luxury inns.