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Re:Washington, D.C. has some amazing startups http://started... by Edmond on Wednesday April 16, 2014 @10:09AM (#7597840)
there's an HN meetup group though it's been dormant for a while:

http://www.meetup.com/JoinHNDC/

Re:Washington, D.C. has some amazing startups http://started... by amr on Wednesday April 16, 2014 @11:14AM (#7598272)
+1 for NoVa (I am in Arlington)