Try Linthicum Custom Slaughtering, I've used them a few times.
Linthicum Custom Slaughtering
5814 Sudley Road
Manassas, VA 20109
Phone: (703) 754-4364
They will skin, cut, wrap, freeze and label your venison. I'm not sure about aging your meat.
There's also:
Springfield Butcher
6816 Bland Street
Springfield, VA 22150
Phone: (703) 451-3033
I haven't used these guys.