Vestfold [ˈvɛstˈfɔl] (13px listen) is a county in Norway, bordering Buskerud and Telemark. The county administration is in Tønsberg, and the largest city is Sandefjord. With the exception of Oslo county, Vestfold is the smallest county in Norway by area.Vestfold is located west of the Oslofjord, as the name indicates.