It turns out Bloomingdale is a new neighborhood! Not sure exactly when it came into being, but for the sake of argument, let's assume it's happened in the last year or two.
I'm looking forward to checking this new neighborhood out! Wonder what was there before the hot new Bloomingdale neighborhood appeared? It would be neat if someone could dig up that history. Maybe it was a corn field back in the 1980s? It must have been platted some time in the 1990s, with construction beginning at the dawn of the current millennium. Great to hear that DC continues to grow!
Now, in all honesty, this is just another example of people in one part of the city "discovering" a part of town that simply wasn't on their radar. DC's neighborhoods, from North Portal Estates to Bellevue, from the Palisades to Capitol View, have all been there for years, but some just don't have the recognition of a Dupont Circle or a Capitol Hill. Eventually, the "gentrification wave" washes over them, though, and suddenly a neighborhood becomes a "hot, new" place. Get ready for it, Deanwood. You don't really exist right now, but someday, you'll become hip and cool, and someone will declare you "new."