I'm in southern Maryland, near Lexington Park. Most contractors have offices all over and probably most have division/sector headquarters located in the VA-MD-MD area. I'm about an hour or less south of DC, but I'm looking forward to planning weekly weekend trips to the DC and Baltimore areas, since the area I'm located is pretty rural.
I'm part of the Integrated Systems sector within the Aerospace Systems business sector (don't ask, they've done restructuring and renaming of the divisions within the company recently so I'm told). The offices I'm working at were once a small private company that has been bought by Northrop Grumman supposedly.
What company are you interning with?