We've had some interest from prospective franchise owners in DC, but we haven't found the right fit quite yet. I'm guessing we'll have a gym there within 18 months - the numbers are too strong to ignore. #5 in the nation in terms of hits to StartingStrength.com with ~56k in the last 12 months. It's just under Dallas, LA, New York, and Chicago in terms of web traffic.
I'm in the Woodbridge/Manassas/Dale City triangle. Got myself set up in my basement with a fairly well-equipped home gym. Working well for me, and I've managed to invite a few friends over for some really early NLP trials - getting body position and movement patterns down solid for one of the guys who has never lifted in his life. Been doing this since mid-May, and I'm making good progress on getting more weight on bar. Maybe someday will pursue a SSC certification, but not planning on opening a gym as my own business.
But, if a SSC affiliate gym was to open in the area, I might be convinced to join up. Fairfax County could be do-able, especially if it's in the Burke/Chantilly area. Tysons area is a non-starter as I have no intent of voluntarily getting into that traffic nightmare - LOL!
There's a Golds about 3 miles away, in the Lake Ridge area. I was a member years ago ...