Well technically it is in Northern Virginia but saying "Washington, DC" sounds cooler I think. I've been guilty of that too, can't blame them. "Virginia startup IPO" doesn't have the same ring to it.
I recommend living in the Crystal City/Arlington area until you have kids. You got easy access to DC/Pentagon, but you can go as west as Dulles Airport, north to Bathesda, or even slightly south on 95 because of the opposite commute.
There are even some jobs in the area.