Just did the DO search on the AOA website, and there are actually QUITE a few OMM practitioners in the Northern Virginia / DC area. I was actually pretty shocked about it. There's also a very event split between primary care and specialists as well: an otolaryngologist, lots of rads, a neurosurgeon, lots of orthos, a couple cardiologists, derms, etc...
Wish I would have checked this out long ago...