Travelers are voting Angel Island as the best island in Napa County. There are 2 islands near Benicia a city just 31 km from Napa County and 2 islands near Novato which is 32 km distant. The most popular of these are Alcatraz Island near Benicia and Angel Island around Novato. You can find 9 islands near California and 140 islands in the country of United States. Our members favorite in California is Catalina Island and Alcatraz Island is the top pick in United States. Want more? Check out our map of islands in Napa County.