New England is Maine, New Hampshire, Vermont, Massachusetts, Rhode Island & Connecticut.
The Mid-Atlantic is New York, New Jersey, Pennsylvania, Delaware & Maryland.
The South is Virginia, West Virginia, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Louisiana, Kentucky & Tennessee.
Calling "Northern VA" part of the North and the rest of VA part of the South isn't right, even if there are two very different areas of the state. Many would refer to Western PA as the Midwest, but since it stretches all the way to NJ, it's still a Mid-Atlantic state. Let's not get picky - W&L, UVA, William & Mary, etc. are all southern schools.
The North/South line pretty much the old Mason-Dixon line. There's a reason Washington, DC is where it is.