Seen in the city:
American Crow (Corvus brachyrhynchos)
European Starling (Sturnus vulgaris)
Lots more I haven't identified.

Seen while canoeing on the Potomac:
Bald Eagle (Haliaeetus leucocephalus)
Great Blue Heron (Ardea herodias)
Barred Owl (Strix varia)