what county is Norfolk Va in?
Given how the city of Roanoke, VA exists independently of Roanoke County, VA, Norfolk, VA is surrounded by a number of other independent cities (like Chesapeake, Virginia Beach, et al) which are not constituted as a counties under Virginia law. In fact, the closest counties are Isle of Wight, York and Northhampton (which is on the Delmarva Pennisula)
http://en.wikipedia.org/wiki/List_of_Virginia_counties