Napa is in the state of California.Napa is the county of Napa County, California. It is the principal city of the Napa county Metropolitan Statistical Area, which encompasses Napa county. Napa is located 50 miles north of San Francisco in the southern end of scenic Napa Valley.Napa has cool, wet winters and very warm, dry summers. The Napa River traverses the city on its journey to the San Pablo Bay. http://wikitravel.org/en/Napa