Oak Grove is an unincorporated community in the Washington District of Westmoreland County, Virginia. The community, on the historic Northern Neck of Virginia (the peninsula between the Potomac and Rappahannock Rivers), was a Colonial stagecoach stop in the early days of the Colony of Virginia. It is only minutes from the birthplaces of George Washington and James Monroe. The community lies in a region of historic architecture with five nearby properties including the plantation house of Wirtland at Oak Grove, listed on the National Register of Historic Places.