Mini bagels near Capitol Hill
Really sorry, but I haven't heard of a good mini-bagel in DC since Posin's closed. And that was probably 15 years ago. A google search reveals a place called Bagels & Baguettes that isn't too far (236 Mass Ave NE), but 1) I don't even know if they have mini-bagels and 2) i don't know if they are any good, as I have never been there. The best bagels downtown I have had are from Bruegger's, but I don't think they do minis (I would also expect that my opinion may be contraversial).
500 John Carlyle St, Alexandria, VA 22314