The Northern Neck is the northernmost of three peninsulas (traditionally called "necks" in Virginia) on the western shore of the Chesapeake Bay in the Commonwealth of Virginia (along with the Middle Peninsula and the Virginia Peninsula). The Potomac River forms the northern boundary of the peninsula; the Rappahannock River demarcates it on the south. The land between these rivers was formed into Northumberland County in 1648, prior to the creation of Westmoreland County and Lancaster County.
The Northern Neck encompasses the following Virginia counties: Lancaster, Northumberland, Richmond, and Westmoreland; it had a total population of 50,158 as of the 2020 census.